Hacking Question NSP corrupt and FAT32 microSD

JeppR · Nov 9, 2019

Hy guys, i have a problem with my Switch (Atmosphere 9.0.1 emuMMC) and the 256gb Samsung EVO MicroSD card.
I have two partition on this card:
- First partition of 207gb formatted in FAT32 for my games and hb;
- Second RAW partition of 32gb with emuMMC installed.

The problem is the frequently file corruption that happens when i try to install more than 10/12 NSP games on it.
When i try to install or do something on microSD with games installed (ex. run a homebrew or install a little dlc or game)... in most cases the files are corrupted and the damaged games need to be reinstalled. It's really frustrating to reinstall everything every time.

I also tried with the exFat filesystem and the problems are more frequent than FAT32.
Is the Switch compatible with 256gb microsd card?...or i need a 128gb card?
Does anyone have problems with this Samsung microsd?
Please give me a solution, thanks

MUDD_BR · Nov 9, 2019

Are you sure your sd is original? Switch supports 256 and bigger cards. Try to format and follow again the guide: https://switch.hacks.guide/

JeppR · Nov 10, 2019

It says that the guide is outdated, it suggests me to follow the github version guide. I found the partitioning guide at this link. I will try to follow this reformatting entire SD card... and I’ll try to re-mod the switch with the new partition table.

Yeah, I’m sure that my SD is original. I tested it on a WiiU to tranfer 230gb of .wup files without any problem.

nifoc2099 · Nov 10, 2019

I have a Faulty Samsung card before on my phone. All the pics & vids inside gone from time to time. Formatting it wouldnt help either be it FAT32, ExFAT nor NTFS (on my phone). I suggest you try a different card. I hope you did backup your NAND & save files and store them in other storage media.

dangobear · Nov 10, 2019

I have almost the exact same setup as you - Atmosphere 9.0.1 emuMMC, though 256GB EVO+ (FAT32) instead of EVO but that probably doesn't make much difference. 14 large NSPs installed with no problems.

If you haven't done so already, run H2testw to make absolute sure that there's nothing up with your SD card.

JeppR · Nov 10, 2019

Oh... the H2testw test had a negative result and my microsd has some errors. This is the H2 log:

The media is likely to be defective.
238.4 GByte OK (500104512 sectors)
352 KByte DATA LOST (704 sectors)
Details:352 KByte overwritten (704 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
0 KByte corrupted (0 sectors)
352 KByte aliased memory (704 sectors)
First error at offset: 0x000000013fff0e00
Expected: 0x000000013fff0e00
Found: 0x000000013fff8e00
H2testw version 1.3
Writing speed: 71.2 MByte/s
Reading speed: 70.8 MByte/s
H2testw v1.4

...it's damaged right? what should i do now?

Username4321 · Nov 10, 2019

If your card's no good, try to get it replaced under warranty or buy another one.

dangobear · Nov 10, 2019

JeppR said:
Oh... the H2testw test had a negative result and my microsd has some errors. This is the H2 log:

The media is likely to be defective.
238.4 GByte OK (500104512 sectors)
352 KByte DATA LOST (704 sectors)
Details:352 KByte overwritten (704 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
0 KByte corrupted (0 sectors)
352 KByte aliased memory (704 sectors)
First error at offset: 0x000000013fff0e00
Expected: 0x000000013fff0e00
Found: 0x000000013fff8e00
H2testw version 1.3
Writing speed: 71.2 MByte/s
Reading speed: 70.8 MByte/s
H2testw v1.4

...it's damaged right? what should i do now?

I have no idea what the errors mean but your best bet is probably to get a new micro SD.

JeppR · Nov 12, 2019

dangobear said:
I have almost the exact same setup as you - Atmosphere 9.0.1 emuMMC, though 256GB EVO+ (FAT32) instead of EVO but that probably doesn't make much difference. 14 large NSPs installed with no problems.

If you haven't done so already, run H2testw to make absolute sure that there's nothing up with your SD card.

Is your MicroSD FAT32 32k cluster size or 64?
I read that for the 256gb microsd a 64k cluster size is recommended...

dangobear · Nov 12, 2019

JeppR said:
Is your MicroSD FAT32 32k cluster size or 64?
I read that for the 256gb microsd a 64k cluster size is recommended...

I didn't specify a cluster size and left it default.

JeppR · Nov 12, 2019

Ahh...ok then the cluster size is 64k by default. I’ll try to re-format my Microsd to FAT32 with this default value.

andyhappypants · Nov 12, 2019

JeppR said:
Ahh...ok then the cluster size is 64k by default. I’ll try to re-format my Microsd to FAT32 with this default value.

I would return it for a new one. Formatting it wont make any difference if the card has errors.

JeppR · Nov 12, 2019

Problem solved with a new MicroSD.
Thanks to all

andyhappypants · Nov 12, 2019

JeppR said:
Problem solved with a new MicroSD.
Thanks to all

Good stuff, glad you got it sorted

Hacking Question NSP corrupt and FAT32 microSD

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