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3

Converting img file to FAT32

rated 0 times [ 3] [ 0] / answers: 1 / hits: 3637 / 3 Years ago, sun, october 31, 2021, 12:26:36

I'm trying to make convert an img file to FAT32.

Here is the code I execute:

sudo dd if=/dev/zero of=./testImage bs=10000000 count=1

Then the output I get is:

1+0 records in

1+0 records out

10000000 bytes (10 MB) copied, 0.0609494 s, 164 MB/s

Then if I do this code:

sudo mkfs.vfat -F 32 ./testImage

Then the output I get is:

mkfs.vfat 3.0.12 (29 Oct 2011)

WARNING: Not enough clusters for a 32 bit FAT!

I am trying to debug my code but I can't create a FAT file to debug...

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iething

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2 Years ago

answered 3 Years ago ligenvirt · Accepted Answer

10 MB is not big enough for FAT32. Typical use cases for FAT32 are disks larger than 512 MiB, below that usually FAT16 is used.

It seems that the minimum size is somewhere around 33 MiB:

$ dd if=/dev/zero of=./testImage bs=1M count=33

33+0 records in

33+0 records out

34603008 bytes (35 MB) copied, 0.0230871 s, 1.5 GB/s

$ mkfs.vfat -F 32 -v ./testImage

$

By the way, you do not need to use sudo for any of these commands if your user has permissions to create files in the current directory (.)