On Ubuntu IOException "missing boot sector signature" is thrown

[jaapdejong]

The same code works under windows and mac.
The exception is thrown after calling
final FatFileSystem fileSystem = FatFileSystem.read(channel, true);
which at some point calls
public static BootSector read(BlockDevice device) throws IOException {

[waldheinz]

There is not much logic involved when checking the presence of a boot sector, so I can only assume the problem lies somewhere else. What kind of device are you trying to read from? Was it created by fat32-lib itself? Can it be read by other operating systems?

[jaapdejong]

I created it under debian with:

dd if=/dev/zero of=tmpimage bs=1M count=120
mkfs.vfat -F32 tmpimage

I can read that image under ubuntu, windows and osx.
Also the same image + code works under windows and osx, but not under ubuntu.

I agree that the boot sector check is plain simple and so I guess I should look somewhere else for the error....

[waldheinz]

Thanks for taking the time to have a look. If you can't make any sense of this I'd be interested in getting my hands on the failing image file if you can find some place to upload it.

[jaapdejong]

And thank you for the support! Will keep that in mind.