Hi! With HP CDwriter 9100 (=Sony CX140 or something like this) with hdd=ide-cd I get: $ ./trigger_rahead /dev/hdd ioctl: Input/output error Apr 24 08:50:02 mandala kernel: hdd: packet command error: status=0x51 { DriveReady SeekComplete Error } Apr 24 08:50:02 mandala kernel: hdd: packet command error: error=0x54 Apr 24 08:50:02 mandala kernel: ATAPI device hdd: Apr 24 08:50:02 mandala kernel: Error: Illegal request -- (Sense key=0x05) Apr 24 08:50:02 mandala kernel: Invalid command operation code -- (asc=0x20, ascq=0x00) Apr 24 08:50:02 mandala kernel: The failed "Set Read-ahead" packet command was: Apr 24 08:50:02 mandala kernel: "a7 00 00 00 04 00 00 00 04 1a 00 00 " -- ciao norb +-------------------------------------------------------------------+ | Norbert Preining http://www.logic.at/people/preining | | University of Technology Vienna, Austria preining@logic.at | | DSA: 0x09C5B094 (RSA: 0xCF1FA165) mail subject: get [DSA|RSA]-key | +-------------------------------------------------------------------+