I'm getting the exact same error as the original poster was. I'm using packet-2.4.19-pre2 and udftools-1.0.0b2. Here's the exact error: hapablap:/home/srwalter# cdrwtool -d /dev/scd0 -q -t 4 using device /dev/scd0 setting speed to 4 1433KB internal buffer setting write speed to 4x Settings for /dev/scd0: Fixed packets, size 32 Mode-2 disc I'm going to do a quick setup of /dev/scd0. The disc is going to be blanked and formatted with one big track. All data on the device will be lost!! Press CTRL-C to cancel now. ENTER to continue. Initiating quick disc blank Disc capacity is 275744 blocks (551488KB/538MB) Formatting track wait_cmd: Invalid argument Command failed: 04 17 00 00 00 00 00 00 00 00 00 00 - sense 05.2c.00 format disc: Illegal seek hapablap:/home/srwalter# Additionally, if I attempt the format using ide-cd instead of ide-scsi, the following error appears in dmesg: hda: packet command error: status=0x51 { DriveReady SeekComplete Error } hda: packet command error: error=0x54 ATAPI device hda: Error: Illegal request -- (Sense key=0x05) Command sequence error -- (asc=0x2c, ascq=0x00) The failed "Format Unit" packet command was: "04 17 00 00 00 00 00 00 00 00 00 00 " Error in command packet byte 26 bit 1 Any ideas why this is happens, or what possible fixes there are? Thanks -- -Steven In a time of universal deceit, telling the truth is a revolutionary act. -- George Orwell He's alive. He's alive! Oh, that fellow at RadioShack said I was mad! Well, who's mad now? -- Montgomery C. Burns