DEV Community: Miftahul Rizki

Install Mininet on Ubuntu for Network Simulation: 3 Methods That Actually Work

Miftahul Rizki — Wed, 07 Oct 2026 02:21:05 +0000

Learning computer networking is ten times easier when you can build a topology and ping it yourself. The problem: most students do not own a stack of switches. Mininet fixes that — a free, open-source network emulator that turns one Linux machine into a complete virtual network lab in seconds.

What Mininet is

Mininet creates a realistic virtual network — running the real kernel, switch, and application code — on a single machine, controlled through a CLI and a Python API. It is the go-to tool for learning and researching Software-Defined Networking (SDN) with OpenFlow and P4, released under a permissive BSD license. Each virtual host runs real Linux applications like ping and iperf, so experiments behave like the real thing.

3 ways to install it on Ubuntu

1. Via APT (easiest). One command and you are done:

sudo apt update
sudo apt install -y mininet openvswitch-switch
mn --version

I ran exactly this on Ubuntu 24.04 and got version 2.3.0 straight from the official universe repository. For beginners, this is all you need.

2. From source (latest version). Clone the official repo and run the installer script:

git clone https://github.com/mininet/mininet
cd mininet
git checkout -b mininet-2.3.0 2.3.0
util/install.sh -nfv

This is the method most university SDN lab reports use — you pick the exact version and can enable extra components.

3. Pre-built VM image. The Mininet website offers ready-made VM images for VirtualBox/VMware. Download, import, run — ideal if your main machine runs Windows or macOS.

Your first test: pingall

After installing, verify everything works:

sudo mn --test pingall

This builds a default topology (one switch, two hosts, one controller), pings every host from every other host, then cleans up. A healthy install ends with *** Results: 0% dropped (2/2 received).

Honest note from my own attempt: on my container-based VM the command stalled at *** Adding hosts: because the environment blocks network namespace creation (setns: Operation not permitted) — and every Mininet host is a Linux network namespace. That is an environment limitation, not a Mininet bug; on bare-metal Ubuntu or a normal VirtualBox/VMware VM it runs fine. I also learned that the APT install ships no default OpenFlow controller, so Mininet prints No default OpenFlow controller found and falls back to OVS Bridge — completely normal for basic topologies.

5 commands worth memorizing

sudo mn — interactive CLI with the default topology
pingall — connectivity test between all hosts
h1 ping -c1 h2 — ping from a specific host
xterm h1 h2 — open a terminal on each host
exit then sudo mn -c — quit and clean up leftover topologies

Try variations like sudo mn --topo single,3 or sudo mn --topo linear,4 once you are comfortable. The full Indonesian walkthrough — including troubleshooting for the errors above — is in the complete Mininet on Ubuntu guide.

USB 2.0 vs 3.0 Flash Drives: 7 Things Worth Knowing Before You Buy

Miftahul Rizki — Tue, 06 Oct 2026 01:52:09 +0000

If you're shopping for a USB flash drive, you've seen the labels: USB 2.0 and USB 3.0. The headline difference is speed — USB 2.0 tops out at 480 Mbps while USB 3.0 reaches 5 Gbps, roughly ten times faster on paper. In practice, the gap is closer to 3–4x: a decent USB 2.0 drive runs at 30–40 MB/s, while a good USB 3.0 drive reads at 80–200 MB/s. Still a massive difference when you're copying gigabytes.

Here are the seven things that actually matter:

1. Real-world speed, not the box number. Mbps means megabits — divide by eight to get MB/s, then subtract protocol overhead. A cheap "USB 3.0" drive can write as slowly as 10–30 MB/s. The connector type alone guarantees nothing.

2. Spot the difference physically. Blue plastic inside the connector usually means USB 3.0; black or white usually means USB 2.0. Certified 3.0 gear often carries an "SS" (SuperSpeed) logo, and USB 3.0 connectors have 9 pins versus 4 on USB 2.0. Color coding isn't an official rule though, so check the specs.

3. They're fully cross-compatible. A USB 3.0 drive works in a USB 2.0 port and vice versa. The catch: speed always follows the slowest link in the chain. A fast drive in an old port runs at old-port speed.

4. The naming trap. USB 3.0, USB 3.1 Gen 1, and USB 3.2 Gen 1 are the same thing (5 Gbps) — just renamed over the years. The genuinely faster tier is Gen 2 (10 Gbps). Read the "Gen", not the "3.x".

5. USB-C doesn't mean fast. Type-C is only a connector shape. Plenty of cheap Type-C flash drives still use the USB 2.0 protocol inside.

6. Power and duplex. USB 3.0 delivers up to 900 mA (vs 500 mA) and uses full-duplex communication — sending and receiving simultaneously — while USB 2.0 takes turns.

7. Buy by the numbers. Look for stated read/write speeds (aim for 100+ MB/s read) rather than trusting the "USB 3.0" label. I ran the math myself: copying a 4 GB movie takes nearly 2 minutes on USB 2.0 versus about 27 seconds on USB 3.0 — over four times faster.

I wrote a deeper Indonesian-language guide covering all of this with a hands-on transfer-time calculation: Perbedaan USB 2.0 dan 3.0 pada Flashdisk: 7 Hal Penting Sebelum Beli. If you're picking a drive, my guide to choosing a good flash drive (also in Indonesian) walks through the buying checklist step by step.

microSD vs USB Flash Drive: 7 Differences That Matter Before You Buy

Miftahul Rizki — Mon, 05 Oct 2026 07:03:04 +0000

Choosing between a microSD card and a USB flash drive looks simple, but the details matter. Both store your files, yet they behave very differently. Here are seven practical differences to know before you buy.

1. Physical size

A microSD card measures just 11 x 15 x 1 mm - about the size of a fingernail - while a USB flash drive is several times bulkier. That tiny footprint makes microSD the obvious pick for phones, action cameras, and drones.

2. Compatibility and how you use them

A flash drive plugs straight into any USB port on a laptop or PC. A microSD card needs a card slot, adapter, or reader. The upside: with a cheap USB card reader, a microSD card works exactly like a flash drive.

3. Speed classes

Flash drives come in USB 2.0 (up to about 60 MB/s) and USB 3.x (hundreds of MB/s). MicroSD cards use their own speed ratings: Class 10, U1/U3, V30 for video, A1/A2 for apps, and buses UHS-I (up to 104 MB/s) versus UHS-II (up to 312 MB/s). Always match the card class to your device's requirements - a fast card in a slow slot is wasted money.

4. Capacity types

MicroSD cards come in three families: microSDHC (up to 32 GB), microSDXC (up to 2 TB), and microSDUC (up to 128 TB). Older devices may not read the newer types, so check what your gadget supports before buying a high-capacity card.

5. File system limits

Both drives typically ship formatted as FAT32 or exFAT. The catch with FAT32: no single file can exceed 4 GB, which breaks large 4K video recordings or disk images. exFAT removes that limit, so reformat if needed.

6. Durability

MicroSD cards have no moving parts and no exposed USB connector that can snap off, which makes them more pocket-friendly. Both types have limited write cycles though, so always keep a backup of anything important.

7. Price

Per gigabyte, microSD cards are often cheaper - especially at higher capacities - partly because many laptops, cameras, and handhelds already have microSD slots built in. If you already own a reader, microSD usually wins on value.

Bonus: turn a microSD card into a flash drive

Plug a microSD card into a USB card reader and it behaves exactly like a flash drive - a handy trick when you are short on portable storage. You can read the full comparison in Indonesian for more detail on each of these seven points.

Quick buying guide

For a phone, camera, or drone -> get a microSD card (check the supported type and speed class)
For plug-and-play transfers between computers -> get a USB flash drive
For single files larger than 4 GB -> make sure the drive is formatted as exFAT

Pick the storage that matches your device, not just the biggest number on the box.

How to Choose a Good USB Flash Drive: 7 Things to Check Before You Buy

Miftahul Rizki — Sun, 04 Oct 2026 01:33:33 +0000

Buying a USB flash drive looks simple until you see the price spread: a 64GB drive can cost anywhere from a couple of dollars to five times that. Here is the practical checklist I put together — based on a quick capacity test I ran myself — so you don't end up with a slow, fake, or short-lived drive.

1. Match capacity to your actual needs. 32–64GB is plenty for documents and schoolwork; 128–256GB for photo/video backups. Don't pay for terabytes you'll never fill.

2. Prefer USB 3.x over USB 2.0. In real-world speeds, copying a single 4GB file takes about 2 minutes on USB 2.0 versus ~34 seconds on USB 3.x. Look for the blue connector (9 pins) instead of black (4 pins). USB 3.x drives still work in old USB 2.0 ports — just at the slower speed.

3. Stick to reputable brands — and watch for fakes. SanDisk, Kingston, Samsung, V-Gen, Transcend, and Lexar all have solid track records. A 1TB drive selling for pocket change is almost certainly a fake with manipulated firmware.

4. Check your ports first: USB-A, USB-C, or OTG. If you move files between your phone and laptop often, get a dual-drive (USB-A + USB-C/OTG) so you don't need an adapter.

5. Read the read/write speeds, not just the capacity. Two 64GB drives can perform very differently. Look for at least ~100 MB/s read for general use, and note that "up to" on the packaging means ideal conditions.

6. Pick a durable design. Metal body or thick plastic, a cap that won't get lost (retractable or swivel beats a loose cap), and a keyring hole so the drive doesn't vanish in your bag.

7. Buy from trusted sellers with official warranty. Big brands usually offer 2–5 years. Keep the receipt and packaging — warranty claims need the serial number on the drive.

One thing my test confirmed: a 64GB drive showing ~59.6GB in your OS is NOT fake. Manufacturers count 1GB as 1,000^3 bytes while operating systems use 1,024^3 — a consistent ~6.9% gap across all sizes. Only worry if the gap is huge (64GB reading as 8GB).

For the complete test data and the full Indonesian version of this guide, check out my detailed guide on choosing a good USB flash drive.

Also worth reading: how to spot a fake flash drive before you buy.

SanDisk Ultra vs SanDisk Extreme USB Flash Drives: What's the Real Difference?

Miftahul Rizki — Sat, 03 Oct 2026 01:47:12 +0000

If you've ever shopped for a USB flash drive, you've probably noticed SanDisk sells two similar-looking product lines: Ultra and Extreme. Similar shapes, similar capacities — but the Extreme models cost two to three times more. So what are you actually paying for? I originally published a detailed Indonesian comparison on my blog, and this is the adapted English version.

Speed: where the real gap lives

The SanDisk Ultra line (Ultra CZ48, Ultra Flair, Ultra Fit, and Ultra Luxe) is the everyday lineup. Official read speeds run from 130 MB/s on the base models up to about 400 MB/s on the fastest Ultra Luxe variants. Write speeds are usually much lower, which matters most when you copy large files onto the drive.

The SanDisk Extreme line is built for performance. The Extreme Go is rated up to 400 MB/s read and 240 MB/s write, while the flagship Extreme Pro reaches up to 420 MB/s read and 380 MB/s write over USB 3.2. Write speed is the key differentiator — writing big video projects or photo libraries to an Extreme drive is dramatically faster.

Price and warranty

That performance comes at a premium: Extreme models typically cost 2–3x more than comparable-capacity Ultra drives. In return you get faster sustained transfers and usually a stronger warranty tier. For casual use — documents, music, occasional file transfers — Ultra is the smarter value. For professionals moving gigabytes every day, the Extreme line earns its price in time saved.

Important: these numbers are for USB flash drives, not microSD cards

SanDisk reuses the "Ultra" and "Extreme" names on its microSD cards, which are entirely different products with different speed ratings. Don't mix them up — every figure above applies to USB flash drives only.

Which one should you buy?

Everyday use (documents, backups, media): SanDisk Ultra — affordable and plenty fast.
Tiny form factor (a drive that barely sticks out of a laptop): Ultra Fit or Ultra Luxe.
Heavy lifting (4K video, large photo libraries, daily backups): Extreme Go or Extreme Pro — the write speeds are worth it.

For the full spec table and local pricing notes, see the original Indonesian version.

Do You Need to Defrag an SSD? The Short Answer Is No

Miftahul Rizki — Fri, 02 Oct 2026 01:36:00 +0000

Defragmenting a hard drive used to be essential maintenance. But if you've upgraded to an SSD, that old habit can actually hurt your drive. Here's why — and what to do instead.

The short answer: no, SSDs don't need defrag

Defrag was designed for spinning hard drives (HDDs). An HDD has a physical read/write head that must move across a rotating platter to reach scattered file fragments, so reorganizing fragments back into order genuinely speeds things up.

SSDs have no moving parts. Data lives in flash memory chips, and every cell is read in exactly the same amount of time no matter where it sits. There is no "travel time" to optimize, so defrag solves a problem that doesn't exist.

3 technical reasons defragging an SSD is a bad idea

1. No moving parts, no benefit. An SSD accesses every memory cell in constant time. Rearranging data on an SSD is like tidying books in a library where every book teleports to your hand — the order doesn't matter.

2. Defrag shortens SSD lifespan. Every flash memory cell has a limited number of write-erase cycles (measured as TBW, Total Bytes Written). Defrag rewrites practically the entire drive's contents, burning through those precious write cycles with zero performance gain in return.

3. Wear leveling cancels it out anyway. SSD firmware deliberately spreads writes across all cells to prevent any cell from wearing out early. Even if the OS "tidies" data logically, the SSD controller silently remaps it to different physical cells. The effort is undone by design.

What actually maintains an SSD: TRIM

The real "defrag for SSDs" is called TRIM — an OS command telling the SSD which data blocks are free, so it can clean them in the background and stay fast.

I verified this on my own Linux machine: the OS detects drive type through a rotational flag (0 = SSD, 1 = HDD), and uses that same detection to decide between TRIM and defrag. Windows does the equivalent behind its "Optimize" button — for an SSD, "Optimize" runs TRIM, never defrag.

To check TRIM on Windows, run as administrator: fsutil behavior query disabledeletenotify — a result of 0 means TRIM is active. On Linux, sudo fstrim -v / runs it manually.

Quick SSD care checklist

Never defrag an SSD (no speed gain, shortens lifespan)
Make sure TRIM is active (usually automatic on Windows 10/11 and Linux)
Keep 15–20% free space so wear leveling can work
Update SSD firmware from the manufacturer
Check SSD health via SMART data periodically — see this detailed guide to checking external SSD health

The bottom line: defrag belongs to the HDD era. For your SSD, just leave Windows' automatic "Optimize" schedule running — it already knows to TRIM instead of defrag.

This is an English adaptation of the original Indonesian article: Do SSDs Need Defragging? Answer and Technical Reasons.

How to Check Your External SSD's Health: 5 Reliable Methods

Miftahul Rizki — Thu, 01 Oct 2026 02:01:33 +0000

External SSDs are great for backups and portable storage — but unlike internal drives, checking their health has a catch: some cheap USB enclosures block SMART data entirely, so your health tool shows nothing even when the drive is fine.

Here are 5 reliable ways to check an external SSD's condition:

1. CrystalDiskInfo (Windows, free). Plug the SSD into a USB 3.x port, open CrystalDiskInfo, pick the drive from the Disk menu. Read the Health Status (Good/Caution/Bad), health percentage, temperature, and Total Host Writes. Compare Total Host Writes against the TBW rating on the manufacturer's spec page. Caution appears when remaining life drops to 10% or less.

2. Built-in Windows commands (no install). In CMD: wmic diskdrive get status returns OK or Pred Fail. In PowerShell: Get-PhysicalDisk | Select-Object FriendlyName, HealthStatus, OperationalStatus shows Healthy vs Warning. Quick, but no percentages or temperature.

3. The manufacturer's own tool. Samsung Magician, WD Dashboard, Kingston SSD Manager, or Crucial Storage Executive. This is sometimes the ONLY way to get full data — some portable WD/SanDisk drives restrict SMART access for third-party tools.

4. smartctl on Linux/macOS. sudo smartctl -a -d sat /dev/sdX — the -d sat flag forces SAT passthrough through the USB bridge. Try -d jmicron or -d usbasm if it fails. For NVMe drives, watch Percentage Used, Available Spare, and Media and Data Integrity Errors (should be 0).

5. Hard Disk Sentinel (paid/trial). Continuous monitoring with automatic alerts — good for an external SSD you use daily as a working drive.

What the numbers mean: a Good status + health far above 10% + host writes far from the TBW rating = fine. Worry when health trends down fast, Reallocated Sector Count keeps climbing, or integrity errors appear above 0. Keep sustained temperatures under 70°C.

SSD not detected by health tools? The enclosure is the usual suspect. Try another cable/port, check UASP support, force the device type in smartctl, use the vendor tool — or remove the SSD from the enclosure and connect it directly to the PC.

I wrote a full step-by-step guide in Indonesian covering all of this in depth, including how to read every important SMART attribute and a real test of running smartctl: https://www.miftahulrizki.eu.org/2026/10/cara-cek-kesehatan-ssd-eksternal-5-cara.html

For the complete walkthrough with screenshots, read the full guide here: https://www.miftahulrizki.eu.org/2026/10/cara-cek-kesehatan-ssd-eksternal-5-cara.html

The Complete Flash Drive Guide 2026: How to Choose, Maintain, and Fix One

Miftahul Rizki — Wed, 30 Sep 2026 07:25:06 +0000

Buying a flash drive should be simple, but one wrong choice can cost you your data. After years of using flash drives for everything — coursework, phone backups, OS installers — here's the distilled version of what actually matters.

Pick in 3 steps

Capacity: 16–32 GB for documents, 64 GB for photos and music, 128 GB+ for video and backups.
Speed: Look for a real USB 3.0/3.2 rating with published read/write numbers. No numbers on the box? Assume it's slow.
Connector: USB-A for older PCs, USB-C for modern devices, or dual-connector OTG if you move files through your phone a lot.

Watch out for fakes

The most common trap is a fake-capacity drive — a "1 TB" stick that is really 8 GB with doctored firmware. Always test a new drive's real capacity and speed before trusting it with important files. I wrote a full Indonesian guide covering 7 accuracy tests: https://www.miftahulrizki.eu.org/2026/09/panduan-lengkap-flashdisk-2026-cara.html

exFAT is the sweet spot

FAT32 works everywhere but caps single files at 4 GB — I tested this myself: a 5 GB file was rejected with "File too big" on a real FAT32 volume, while a 100 MB file copied fine. NTFS doesn't work on most Android phones. For modern use, exFAT is the best default.

Keep it alive

Always eject before unplugging, keep ~10% free space, keep it cool and dry, and never treat a flash drive as your only copy of anything important.

Full guide (in Indonesian, with screenshots and a FAQ): https://www.miftahulrizki.eu.org/2026/09/panduan-lengkap-flashdisk-2026-cara.html

How to Check If Your MicroSD Card Is Fake: 7 Accurate Ways to Avoid Getting Scammed

Miftahul Rizki — Tue, 29 Sep 2026 01:35:59 +0000

Fake microSD cards are everywhere these days — and they're sneakier than you'd think. A counterfeit card can claim to be 128GB while actually holding just a fraction of that, silently corrupting or deleting your photos, videos, and files. Here are 7 ways to spot a fake before it costs you your data.

Quick Visual Checks

1. Watch out for suspiciously cheap prices.
If a 128GB card costs less than a cup of coffee, you can guess what you're getting. Always compare with official retail prices from trusted stores.

2. Look for the distributor hologram.
Genuine cards usually ship with an official distributor hologram sticker on the packaging (in Indonesia, names like DataScript or IMS are common). No hologram? That's a red flag.

3. Inspect the print quality.
Blurry logos, off-center printing, or mismatched colors on the card body itself are classic signs of a counterfeit.

4. Check the UPC/barcode on the packaging.
Scan or verify the barcode. Fake cards often reuse invalid or duplicated codes.

The Real Tests

5. H2testw — the gold standard.
H2testw writes data across the card's full advertised capacity, then reads it all back to verify. It takes a while on large cards, but it's the most reliable test available — always run it before trusting a new card with important data.

6. CrystalDiskMark speed test.
Run a quick benchmark. If the read/write speeds are nowhere near the advertised class rating, something is definitely off.

7. The fill-to-full-and-read-back test.
Copy files onto the card until it claims to be full, then try opening them all. Fake cards loop their storage, so files written past the real capacity come back corrupted or vanish entirely.

Other Warning Signs

Constant "format required" prompts on your phone or PC
On Android, apps like SD Insight and A1 SD Bench can quickly reveal the card's real manufacturer and capacity

Stay Safe

Buy from official stores, keep your receipts, and test every new card with H2testw before trusting it with anything important. A few minutes of testing beats losing years of memories.

For the full walkthrough with screenshots, check out the original guide in Indonesian: Cara Cek MicroSD Asli atau Palsu.

Back Up Your Android Photos Without Paying for Cloud Storage

Miftahul Rizki — Tue, 29 Sep 2026 00:21:28 +0000

Cloud storage subscriptions are convenient, but they are also a monthly bill for something you could do yourself in fifteen minutes. If your phone is gasping for space, here are practical backup methods that cost nothing beyond hardware you probably already own.

1. Flash drive + OTG cable: the fastest free method

This is my favorite. Connect a flash drive to your phone with an OTG cable (or use a dual-connector drive with USB-C on one end and you can skip the cable entirely), then copy your DCIM folder — where the camera stores photos and videos. Hundreds of files transfer in minutes, no internet required, no subscription. If you have never done it, follow this guide to back up an Android phone to a flash drive from start to finish.

Format the drive as exFAT beforehand so it can hold video files larger than 4GB, and always eject properly before unplugging.

2. Copy to a laptop with a USB cable

If a computer is available, this is the simplest method of all. Plug in the phone, select "File transfer" mode from the notification, and drag the photo folders to the computer's hard drive. Bonus: the big screen makes it easy to delete blurry shots and duplicates while you are at it.

3. Use the microSD slot, if your phone has one

Some phones still include a memory card slot — an almost effortless backup path. Move photos to the card and set the camera app to save there directly. When you eventually switch phones, the card (and your data) moves with you.

4. Stretch the free cloud tier as a second layer

Google still gives you 15GB free across Gmail, Drive, and Photos. Enable automatic backup in "Storage saver" quality and that 15GB holds far more photos than you would expect. Treat it as your secondary copy, not your only copy.

Keep it organized, or it does not count

A backup you cannot find is barely a backup. A few habits make all the difference:

Back up on a schedule. Once a month beats once a year with 10,000 photos piled up.
Name folders by date. "2026-09 Trip" is searchable; "New Folder (27)" is not.
Keep two copies. One copy is not a backup — it is a hope. Pair the flash drive with the laptop or the free cloud tier.
Delete the junk after backing up. Blurry photos, ancient screenshots, and forwarded memes can go.

Do not wait until the phone is full, lost, or dead. Fifteen minutes today can save years of memories — and the step-by-step OTG backup guide walks you through the easiest method if it is your first time.

Why Your Phone Can't Read a Flash Drive: OTG Causes and Fixes

Miftahul Rizki — Tue, 29 Sep 2026 00:16:07 +0000

You plug a flash drive into your phone with an OTG adapter, wait for the notification… and nothing happens. Before you blame the phone, know this: the vast majority of "OTG not working" cases come down to a short list of fixable causes. Work through them in order.

1. Your phone may not support OTG at all

This is the number one cause, especially on older budget phones. USB OTG requires specific hardware support — no app or setting can add it if the chip is not there. The fastest way to settle the question is to check whether your phone supports OTG with a free checker app from the Play Store. It takes under a minute and saves you from chasing ghosts.

2. The drive is formatted in NTFS

Most Android phones only read FAT32 and exFAT. A drive formatted as NTFS (the Windows default for large drives) will be invisible to your phone. The fix: copy your data to a computer first, reformat the drive to exFAT, then copy everything back. ExFAT also handles files larger than 4GB, which FAT32 cannot.

3. The OTG cable or adapter is faulty

Cheap OTG adapters fail constantly — loose connectors, broken internal wiring, or out-of-spec builds. If you have access to another adapter, swap it in. When the drive suddenly appears, you have found your culprit, and it was never the phone.

4. The flash drive itself is dying

Test the drive on a computer. If the PC also fails to recognize it, or keeps asking you to format it, the drive is the problem. Warning signs of a failing drive include random disconnects and files that corrupt on their own.

5. OTG is disabled in settings

Some manufacturers — notably Oppo, Vivo, and Realme — ship with an "OTG connection" toggle that is off by default. Search your Settings app for "OTG" and turn it on. Note that on some models the toggle switches itself off after about ten minutes of inactivity, so you may need to re-enable it each time.

A quick diagnostic order

To avoid guessing: first verify OTG support with a checker app (there are 4 easiest ways to check OTG support if you want options), then try a different cable, then check the drive's format on a computer, and finally test a different drive. If everything checks out and it still fails — including charging behaving oddly — the USB port itself may be dirty or damaged, and that is the point where a repair shop makes sense.

Most of the time, though, the fix is in steps one or two. Do not conclude your phone is broken before ruling out the simple stuff.

How to Spot a Fake Flash Drive Before It Eats Your Data

Miftahul Rizki — Tue, 29 Sep 2026 00:15:14 +0000

A 128GB flash drive for the price of a coffee sounds like a steal — until your files start vanishing. Counterfeit flash drives are one of the most common tech scams in online marketplaces, and they have become frighteningly convincing. The good news: once you know how the trick works, spotting a fake takes minutes.

The firmware trick behind fake capacity

Here is what the scammers actually do. They take a cheap 8GB or 16GB drive and rewrite its firmware so your computer reports 128GB or even 512GB. Everything looks normal at first. But the moment you store more data than the real chip can hold, the drive silently overwrites or drops your files. Photos corrupt, documents refuse to open, and there is no warning.

This is why a fake drive can pass a casual "plug it in and check properties" test. The lie lives in the firmware, not in anything Windows or Android can see on the surface.

Red flags you can spot before buying

The price makes no sense. A genuine 128GB drive from a reputable brand has a floor price set by the cost of NAND flash itself. If someone sells far below that, they are not being generous — they are selling you 16GB of silicon in a 128GB costume.

The packaging looks off. Blurry printing, misspelled brand names, flimsy plastic, no serial number or warranty information. Genuine manufacturers invest in packaging; counterfeiters do not.

The seller is a ghost. New store, a handful of ratings, no official distributor warranty. Trustworthy sellers state their warranty terms clearly because they have nothing to hide.

Tests that expose the lie

If a suspicious drive is already in your hands, do not trust it with important data until you run a capacity test. Free tools like H2testw (Windows) or F3 (Linux/macOS) write data across the entire advertised capacity and then verify every byte. A fake drive fails loudly. This is the single most reliable way to how to check if a flash drive is genuine — it tests the actual silicon, not what the firmware claims.

Also watch the write speed. A real modern 128GB drive typically writes at tens of megabytes per second. If yours crawls at 2–4 MB/s, that is another strong signal something is wrong.

Already bought one? Do this

First, run the capacity test to find the drive's real size — you can still use it safely for non-critical files as long as you stay under that limit. Second, if you bought it recently, the test results are solid evidence for a refund claim on most marketplaces. For the full walkthrough, from physical inspection to software verification, see these 7 accurate tests you can do at home.

A cheap drive is only a bargain if it is real. Five minutes of checking beats losing years of photos.