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Forum Index : Microcontroller and PC projects : CMM2 vs 128GB SD cards....

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Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9757

Posted: 11:59pm 02 Apr 2022

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I have a customer with a G2 unit, trying to use a 128GB FAT32 SD card, and when they type FILES, the unit just locks up(crashes) with a black screen, and he has to press reset to recover.

Anyone else used 128GB cards in the CMM2?
I have advised him to find a lower capacity card, such as 16GB or 32GB cos I know people use those without issues.

I have not really heard of anyone using a 128GB card in the CMM2, cos it would be highly unlikely to ever need that kind of capacity IMHO.

Manual DOES state that you can use up to 128GB cards formatted in FAT16, FAT32 or exFAT, but does "up to" include 128GB cards too?

I test every single unit before they are sent, so I KNOW it worked just fine with my 4GB test card, and I could navigate through the folders and load programs fine, so I think that the CMM2 perhaps just does not like the taste of 128GB cards, or this specific card anyway.

Peter or Geoff - do you have any comments to make?

Smoke makes things work. When the smoke gets out, it stops!

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 10620

Posted: 07:12am 03 Apr 2022

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Cards over 32Gb must be formatted exFAT.If they are formatted FAT32 then they are using a non-standard block size which isn't supported

From the manual

Quote MMBasic will work with cards up to 128GB in capacity. Cards larger than 32GB should be formatted as
exFAT and cards 32GB or less formatted as FAT32. The recommended size is 8GB formatted as FAT32.

Edited 2022-04-03 17:17 by matherp

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9757

Posted: 08:01am 03 Apr 2022

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EXCELLENT.

Thank you.

I will pass this on to the customer.

Smoke makes things work. When the smoke gets out, it stops!

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