Hardware Just bought a 512gb Sandisk microsd for my Switch, but have tiny corruption error on H2testw

Ichigo1000 · Jun 13, 2021

I have recently ordered microsd cards for use with my switch. But I've encountered a problem where when I test my microsd card through h2testw, it says that I have corrupted data, of 59 kb. I thought it was just a defective card, so I returned it and ordered a new one, but this time I had a corrupted data of 61kb. I'm wondering if this is normal, especially for big cards? I have applications on it and everything seems to run fine, so i am very confused. It seems too much of a coincidence that i got 2 faulty cards with the same problem though. I tested both through fakeflashtest, and they both passed.

pic1972 · Jun 13, 2021

Usually a little bit of space is used by o.s. for some system files... and in a 512 gb card, you had 476 gb which you can use. I have two 512 gb sd card (sandisk ultra and samsung evo plus)...

Ichigo1000 · Jun 13, 2021

pic1972 said:
Usually a little bit of space is used by o.s. for some system files... and in a 512 gb card, you had 476 gb which you can use. I have two 512 gb sd card (sandisk ultra and samsung evo plus)...

do you also have a bit of data lost testing on h2testw?

Hayato213 · Jun 13, 2021

You should return it if you get corrupted data, new legit card would give you result of test finished without error.

pic1972 · Jun 14, 2021

Ichigo1000 said:
do you also have a bit of data lost testing on h2testw?

yes, 58 kb on sandisk and 60 kb on samsung

izy · Jun 14, 2021

Ichigo1000 said:
I have recently ordered microsd cards for use with my switch. But I've encountered a problem where when I test my microsd card through h2testw, it says that I have corrupted data, of 59 kb. I thought it was just a defective card, so I returned it and ordered a new one, but this time I had a corrupted data of 61kb. I'm wondering if this is normal, especially for big cards? I have applications on it and everything seems to run fine, so i am very confused. It seems too much of a coincidence that i got 2 faulty cards with the same problem though. I tested both through fakeflashtest, and they both passed.

usually theres a hidden partition of that size you cannot see.

format the card using Rufus to remove the partition
then test it again

The Real Jdbye · Jun 14, 2021

Ichigo1000 said:
I have recently ordered microsd cards for use with my switch. But I've encountered a problem where when I test my microsd card through h2testw, it says that I have corrupted data, of 59 kb. I thought it was just a defective card, so I returned it and ordered a new one, but this time I had a corrupted data of 61kb. I'm wondering if this is normal, especially for big cards? I have applications on it and everything seems to run fine, so i am very confused. It seems too much of a coincidence that i got 2 faulty cards with the same problem though. I tested both through fakeflashtest, and they both passed.

Legit cards should pass without any errors.
Since this has happened with 2 cards from different manufacturers it may be your SD reader that's the issue (or the MicroSD adapter, those are always cheaply made and kinda dodgy) so you should try with another one.
Other than that you can try formatting it with SDFormatter (quick, format size adjustment: on) and testing it again. If it still fails h2testw you can try a full format, something you don't want to be doing a lot to flash storage because it uses up a write cycle and SD cards only have a limited number of write cycles (like 10000) but doing it just once won't matter much.
If/once you get the test to pass make sure you format it to FAT32 using guiformat or Minitool Partition Wizard before putting it in the Switch. ExFAT will just lead to headaches when your console/game crashes for some reason during writing to the SD and it corrupts the entire card. It's happened to many people, and it's not just in homebrew either, as Pokemon Sword/Shield are/were known to have a crashing bug (no idea if it was fixed) and if autosave was enabled, it could corrupt your card as the crash would happen during the save.

iwantcs6 · Jul 21, 2021

Hello all. Also just bought a 512 Samsung Evo card. Was wondering if anyone had any recommendations on the proper allocation units when formatting to FAT32. I have been trying to figure out what I set my previous 256 GB FAT32 card to, but have not been able to. Thank you

fvig2001 · Jul 21, 2021

I'd return it. I had a similar issue with my 1tb from some unknown brand where it ended up getting write protected after the test.

Hardware Just bought a 512gb Sandisk microsd for my Switch, but have tiny corruption error on H2testw

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