Max SCSI disc size?

What is the maximum size of disc that can be used with the native SCSI format on the BB xm?

256GB. You can use larger discs, but you’d have to tweak the parameters in HForm so that it only formats 256GB.

Thanks. I’m looking for a bit more speed than USB sticks with even MPro crawling. I was concerned about small drives getting scarce but I see there’s still some availability. At least that’s much better than the limits of ADFS and much more than I could use with RISC OS.

256GB is the limit of ADFS! (On RISC OS 5, at least)

But I seem to remember that on RO5 (just ADFS?) only the first 128GB was DMA’d, so file access on the second half of the disc would be slow(er). Not ideal. Who knows what would go where!

Yes, that’s true – the IDE controller in the Iyonix only supports DMA for the first 128GB.

My experience of ADFS is on the Risc PC. ISTR there are issues with the size of file allocation units with discs > 40GB on the motherboard. I think it is also limited to 128GB.

Bought a 120GB HDD today (CnM Core from Maplin if anyone’s looking). Seems to be working OK.

I’ve ‘Configure SCSIFSDrive 4’ from the command line and set ‘Conventional SCSI’ to 1 in the configuration panel. Is that correct. Anything superfluous or extra needed?