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Posted by u/l1nuxx_uzr_num737205 - 60 votes and 15 comments
I've tried to find the problem myself, and I've come to the conclusion that the card is either defective / fake. After running H2TestW on the card, it produced the following information. Warning: Only 6302 of 31991 MByte tested.
Does using H2testw and CrystalDiskMark guarantee the authenticity of a MicroSD card (off AliExpress/Amazon/etc.)? Looking at a 64GB (or 128GB) MicroSD from Sam Sung Store on Ali (seems not to include a warranty of any kind though).
2 wrz 2012 · Using generic formatting utilities may result in less than optimal performance for your memory cards. The SD/SDHC/SDXC memory cards have a "Protected Area" on the card for the SD standard's security function. The SD Formatter does not format the "Protected Area".
15 wrz 2024 · Full Write + Verify the empty card with H2testw. Run this test on a computer with a built-in SD card reader. Don't use a SD-to-USB adapter in case yours is something like those shitty & unreliable T-FLASH. If your card is microSD, use a different micro-to-standard SD adapter.
CapacityTester. Test your new USB flash drive from China to find out if its full capacity can be used or if it's fake! The volume test fills the filesystem, verifying that all of it can be used. It's slow, it takes hours.
6 sty 2020 · I emailed the developer of h2testw asking if he could report the average, max and min write speeds for each write operation instead of just the average. That would give a good indication if this problem existed on a card.
