Why can't I boot FS_Knoppix from the internal card reader in a laptop? I installed FS_Knoppix 6.4.3 via an external USB card reader on my desktop, but couldn't find a way to boot from it. I then tried attaching the same Hama reader to the usb port of a Toshiba Satellite A500 02-F laptop, and it booted fine off that installation to SD card.

OTOH, when I tried to cut out the middle man and stuck the SD card in the Toshiba's internal flash card reader, it was ignored at bootup. With the external USB reader attached, USB showed up in the boot sequence (which I'd configured to boot USB first) as "generic usb", but with the card in the internal slot, there was no sign of any bootable USB device in the system. How come? And is there any way to boot from such a slot?