KFM : I was looking at (and clicking on) the green coloured boxes with 'rd' 'fd' ... Interestingly, there is no 'usb' box, even though the dropdown list certainly has 'usbhd0/1/'.
Because the drop-down box in KFM lists the disks that are actually available, and the green buttons show the disks that were potentially
available in 2007 (the last version of KFM was made on 13/10/2007 - v0.47b - and since then, there were only bug fixes and no new features). Support for USB disks was added in 2011-2012, that's why there is no green button for it.
The first problem, well, not really a problem, more of an observation.
Booting (from CD).
When I set the default 'blue screen' startup "b" to "on" (add the disks visible by BIOS), it takes about 32 seconds to 'search partitians on disk devices', which seems like an eternity (at first I thought it had crashed).
However, if I leave it at the default (off), it passes the 'search...' step virtually instantly, and boots just fine. I had thought it would therefore not know about any disk devices, but all disks & partitians are visible in the file managers (including USB memory sticks).
This option is currently needed only for SATA disks or CD/DVD disks that are not visible in KolibriOS when it's off. If all your disks are visible already, then you shouldn't turn it on, as it only slows down KolibriOS, and nothing more.