FAT32 USB stick 'disc not understood' error

I’m running a recent build of 5.27 (11-Oct-20) on a Pi4. Inserting a FAT32 format USB stick into (a) a USB hub connected to the USB2 sockets, or (b) directly into a USB2 socket produces the same error: ‘Error when reading SCSI::0.$ – Disc not understood – has it been formatted?’. All these disks worked fine under 5.24 on a Pi3. Is this a known issue? BTW The Pi is booting off a SCSI SSD successfully.

The Pi 4 can be more picky about USB devices, but in my experience you’re more likely to get a total lockup, not something as benign as an error message.

One thing to check: Is Fat32Fs loaded and running?

One thing to check: Is Fat32Fs loaded and running?

*Modules discloses no such item.

Grab the latest version of Fat32Fs from Jeffrey Doggett’s website and install it in !Boot.Choices.Boot.Predesk.

Thanks, Stuart: that worked, and USB sticks are now readable :-). Interestingly, I couldn’t open the Fat32fs zip file on the Pi4: !SparkFS failed with a ‘not enough memory’ error, which was odd considering this is a 4GB machine, i.e., 4x the memory of any previous Pi here! Another bug?

SparkFS failed with a ‘not enough memory’ error, which was odd considering this is a 4GB machine, i.e., 4x the memory of any previous Pi here!

Are you running the latest version (1.46, 6 Jul 2020)? I think that should be ok on a 4GB hardware.

Remember on a 4GB machine, the amount of free memory is likely to interpreted as a negative value if a signed 32 bit integer is used.

A lot of this software was written when 4MB was the maximum RAM in a RISC OS machine, not 4GB!

Alot of this software

Typo, missing space? Or have you been reading a lot of American malapropisms? :)

My favourite it “normalcy” – which, if I recall correctly was a reasonably obscure word meaning at right angles to. The current, US accepted, is the state of being normal (which I suppose for the US is currently at right angles to the rest)

US is currently at right angles to the rest

My suspicion is that it’s at wrong angles to the rest.

My favourite it “normalcy” – which, if I recall correctly was a reasonably obscure word meaning at right angles to.

Looks like you’re right: ‘It comes from the Latin word for a carpenter’s square – norma’ (Source)

As for alot…

As for alot…

Like, alot :)

Sorry to spoil the fun, but I’ve fixed it.

Sorry to spoil the fun

Rasp!!