Fake SD Card Test & Capacity

💾 A card that says 512 GB may hold 64 GB.

Counterfeit cards and USB drives report a size they do not have. The controller

lies, so your phone believes it and everything looks fine until the day your

photos come back as grey squares. Checking the size does not help, because the

size is the lie.

The only way to know is to write data across the whole card and read it back.

That is what this app does.

■ Who this is for

· You bought a card or a USB drive online and want to check it before the

return window closes

· You are about to trust a card with photos or video you cannot replace

· A card has started losing files and you want to know whether it is worn out

or was never the size it claimed

■ The two tests

⚡ Quick test

Claims space right across the card, drops markers through it, and reads those

markers back. A card that pretends to be bigger than it is wraps around and

overwrites the earlier markers, which is what the markers look for. Allow

roughly a minute per gigabyte, because the space still has to be written once.

🔍 Full test

Writes over every byte and reads all of it back, so it takes about twice as

long. This one tells you whether every part of the card is good, not just

whether the size is honest.

■ What you get

📊 Progress you can actually follow

Percentage, how much has been done, the speed in MB/s and how long is left.

Not a bar that sits still while you wonder whether anything is happening.

🚩 A plain answer

Genuine, false capacity, worn and failing, or did not finish. If the capacity

looks false, the app shows roughly how much of what it wrote could be read back,

a rough guide to what the card really holds.

📄 A report you can send

Save it as a text file or send it straight to a seller or a marketplace. It has

no serial number and no account details in it.

🔌 Memory cards, and USB drives where your phone allows it

Mounted cards are listed next to the internal storage. A USB drive on an OTG

adapter can be tested only if your phone makes it available to apps, which not

every phone does. If it is not listed, the app cannot reach it.

❓ An answer when the card does not show up at all

A card can go missing for three different reasons and each one needs something

different from you. If it was formatted on a computer it may be NTFS, which

Windows reads and Android does not. If it does not appear anywhere on the phone,

it has stopped answering, and no format and no app can bring that back. The app

lays out which one you are looking at instead of just saying nothing was found.

■ Good to know

· Free

· No account and no login

· The test runs entirely on your phone and works without a connection

· Asks you for no permissions at all

· Ads never write anything to your card

· Your existing files are not touched. The app writes only into its own folder

and deletes those files when it finishes

· The app reports anonymous counts of what kind of test was run and how it came

out, never the card's identity and never your report

■ Honest limits

This app cannot repair a counterfeit card. Nothing can. The flash inside is

simply smaller than the label says, and reformatting does not create memory

that is not there. What the app can do is tell you before you lose something.

The app cannot format a card either. Android keeps that for the system alone, so

the app opens the storage settings for you and the phone does the formatting.

A phone can only reach the card through the file system, so the quick test

works by claiming space rather than by addressing raw sectors the way a desktop

tool can. That spots most cards that fake their size, but some cards can hide it

from a quick check. The full test writes and reads every byte, so if you need

certainty, run the full test.

The way the app tells a fake card from a worn one has been checked against

simulated fake cards, not yet against a large set of real counterfeits.

Questions: [email protected]