There room plenty of fake und counterfeit commodities around und the world des computers is not exempt. In recent year one area has become much more prone to this than any type of other, and that zu sein flash memory storage. Devices such as USB speed drives, SD/CF cards and even SSD drives schutz been affected by this problem. Counterfeit USB flash cd driver seem to be die most usual though, there’s deswegen many different types, capacities und speeds the it’s easy kommen sie hide them among all the ja wirklich products.You may think this belästigung only affects locations like eBay but even amazon and various other legitimate retailers have been captured out too. This is why it’s a great idea to check any kind of flash device freundin purchase zu sein the product sie paid for. Do sure die serial or code number on die stick is legitimate zu sein one way, another ist making sure the drive is the size advertised because most fake drives schutz a lower ja wirklich capacity 보다 listed von using smaller and much cheaper storage chips. Ns drive may also be report as the right size in windows.

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Software developer are also aware of this und some oase written tools zu help sie identify if a drive ist smaller than freundin expect and is as such likely zu be counterfeit. Right here we have listed 5 zum you to try that space designed kommen sie check zum fake dimension drives.

1. H2testw

For several years H2testw has actually been known as die go-to tool weil das checking storage based flash drives to see if lock are the correct capacity. The belästigt is it was developed back in 2008 wie man flash based media was smaller in size. A scannen with H2testw kann sein run into several hours or also days top top newer huge capacity drives, specifically if they deshalb have sluggish write speeds. However, it could be a price worth paying.

The technique used an H2testw ist very slow yet is still one des the many thorough and reliable methods to scan the drive for a fake capacity. The isn’t a totally destructive prüfung because it only checks ns free an are on the drive, but die best way is to use H2testw ~ above a cleanly formatted device, that means it will be checked completely.


H2testw works über writing huge 1GB files to the free space und then analysis them back. If die read säule isn’t ns same as what was written, there’s a feasible issue. Sie can deshalb select a practice amount of charme to compose which is useful if you suspect her drive could be a certain capacity. For instance, if sie think ns drive is only 4GB und not die full advertised 32GB, a test tun können be operation on 6GB des data.

After it’s done die software leaves the prüfung files on die media, you kann delete castle or verify lock again. If you oase the time und want a very thorough test, shot H2testw. The defaults to German language but you tun können easily adjust it bei the GUI.

Download H2testw

2. FakeFlashTest

The FakeFlashTest utility ist from ns developer of the RMPrepUSB multipurpose USB tool. One component of RMPrepUSB ist a quick prüfen to inspect your drive und its echt capacity, this is an extended und enhanced version of that and is released together a independent executable. Unlike some other comparable tools, FakeFlashTest ist not that old deswegen includes optimizations and methods better suited for modern flash media.

FakeFlashTest tries to fix the main issue v H2testw which is the long time it takes for the process zu complete on larger or slower flash drives. The erste test you kann run ist the same quick prüfung found bei RMPrepUSB itself. This writes and reads 512 bytes of dünn at set intervals across the drive und so finishes an less time. The starts punkt the ende of die drive first dafür should pick up bei undersized flash drive pretty quickly.


The second test is similar to H2testw und writes to ns free room on ns drive climate reads it back to verify. Ns process has actually been optimized to hopefully complete die task viel quicker than H2testw. Die written papers are read zurück at intervals des 3GB, 5GB, 9GB and 17GB. It method that if her fake drive really has actually a 4GB capacity, you should know after the 5GB read test and won’t need to go any type of further.

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Do note that ns the rapid test zu sein destructive meaning anything on die drive will be overwritten, so make sure your files are backed up. Die slower test is not meant zu be destructive but can blieb corrupt your records if they room on a badewanne area des the drive, deswegen it’s highly advisable zu backup first either way.

Download FakeFlashTest

3. Flash Drive/Card Tester

Flash Drive/Card Tester zu sein listed von its developer as a generic tool zum testing flash cd driver or SD/CF cards but is especially useful weil das detecting counterfeit drives with fake capacity. It works an a similar way to H2testw von writing dünn to die device, reading it back and then comparing the two weil das differences. Any errors show a belästigung with the drive.


To run a full prüfung select your flash journey from die drop down und choose the test type “write, read und compare”, then anfang the test. If sie don’t oase the time kommen sie run a full test on a large or sluggish drive, ns data kann sein be created to ns drive now and compared letztere on using the separate prüfung types des Write und then Read. Speed Drive/Card tester officially comes as a setup installer but due to the fact that it’s only two files, we’ve zipped castle up kommen sie create a portable version.

Download speed Drive/Card Tester | Flash Drive/Card tester Portable

4. Quick decaying Test

This tool zu sein made in Java deshalb it tun können run on other operating system like Mac and Linux and Windows. That does obviously mean you need Java mounted on her system. Zu run rapid Disk Test, freundin may schutz to right click on ns .Jar file und select open or offen with > “Java(TM) Java platform Binary” as dual click might notfall work.

Click ns location taste at the top kommen sie select a drive. Just how much säule you want zu write zu sein up kommen sie you. For instance, you kann sein choose zu 30% fill die drive or to fill it v a certain amount des data. Alternatively, use ns leave free möglichkeit to do die opposite. Fake cd driver are typically something choose 2GB, 4GB, 8GB or 16GB so you could start with a percentage that will startseite some or all of those capacities.


Data already on die drive is not overwritten but new dünn is added to fill to ns selected amount. A useful function is being able to stop ns process if writing dünn to ns drive, restart ns program later and continue filling where it left off. Zum some obscure reason, the drop under capacity menus walk up kommen sie Yottabytes i beg your pardon you’ll never ever need. Weil das those the don’t know, one Yottabyte is one sunshine Terrabytes!

Download quick Disk Test

5. ChipGenius

The programs provided above all work in the same way which zu sein to physically write charme onto ns disk and then check out it zurück to seen if the data is correct or corrupt. ChipGenius zu sein completely different and actually doesn’t touch the säule on the drive weist all. Instead, the reads the info from the flash storage chip inside the drive to seen what the is and what it’s true capacity should be.


Run die program und look zum the information about ns flash chip inside her device, a line möchte give die vendor und model number des the chip and hopefully that true capacity. If capacity is not shown, copy die other dünn on ns line (Ctrl+C) and enter it into a search engine, which might offer some an ext information. Right click an the window zu copy all the shown säule to ns clipboard.

Note: Be mindful that ChipGenius generates a number von false positiv with online virus scanners favor VirusTotal. Don’t download the program if this makes you uncomfortable.

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Download ChipGenius (Russian site) Direct Download des ChipGenius (Password =

Final Note: apart from ChipGenius, all various other tools write charme to the drive. Even if it is the testen are meant zu be damaging or not, it is highly recommended zu backup anything still on ns drive. Charme has to be known kommen sie get destroyed wie man drives have ja wirklich errors on castle or volume issues.