Fat32FS Maximum Partition Size

Hi Guys,

Title says it all really, I have a 2 TiB disc, so what is the maximum Fat32 partition I can put on it?

I have used Fat32Format to format the first partition as 2 TiB, 1 TiB, 500GiB, and 200GiB, all read fine whilst the disc is plugged in, but will hold the machine up if re-connected, until I unplug it whereby I get a Abort on data transfer @ &FC1E4B1c

*Where
Address &FC1E4B1C is at offset &00005700 in module ‘USBDriver’

Then usually various apps / things fall over.

There is activity initially on the disc when you plug it in, but then nothing.

Eventually (~5 mins) the desktop returns, I may get a ‘filecore in use’ , I will get an error saying ‘insert HardDisc0’ (SD Card), and I get a drive called ‘110F-1F16’ clicking on this causes "Error when reading SCSI::110F-1F16.$ – Not enough memory’ – There is 469332K free, and this was with a 200GiB partition (happens to all partition sizes)

System in use:
Raspberry Pi 1 512MiB, RISC OS5.23 21-03-16
Fat32FS 1.51
SATA USB Dock
Seagate Barracuda 2000GB

TIA

Michael

Try unplugging DosFS.
I have a suspicion that it was changed recently to have a look at any drive plugged in. However, it makes a total arse of it.

Cheers for the support Jeff!

Ok, I have unplugged DOSFS and rebooted.

Plug in the drive, icon almost immediately appeared.

Click on the :4 Icon to get "Error when reading SCSI::4.$ – disc not understood – has it been formatted?

*fat32fs:mount -v :4
Mounting drive 4
Could not open drive 4 (-20).

Sector 0
0000 : EB 5A 90 4D 53 57 49 4E 34 2E 31 00 02 20 20 00 ëZMSWIN4.1.. .

Sector 800 (Logical 0)
0000 : EB 76 90 45 58 46 41 54 20 20 20 00 00 00 00 00 ëvEXFAT …..

Sector BB800800 (Logical BB800000)Divide by zero

I confirmed that Fat32FS is running by using a USB stick which was fine.

Cheers!

Error -20 is that the “bytes per sector” in the Volume Boot Record isn’t 512.
There’s enough of it shown above to imply that the partition has been formatted to EXFAT, which Fat32fs doesn’t understand. Hardly surprising that it also took out DosFS.
Try formatting again?

Ah! My messing around did indeed end up with Partition 0 being exFat! oops

However the issue before did remain, and does come back when DosFS is re-plugged

Formatting again under Fat32FS results in a Disc which can be read under Windows, and RISC OS.

and the partition size: 1863 GiB! (although FAT32 at -c64 the empty disc already has 466MiB used! ouch!)

Thank you Jeff for a superb program!