From: Kronos cdrom_read_toc (ide-cd.c) always reads the TOC using MSF format. If the last session of the disk starts beyond block 1152000 (LBA) there's an overflow in the MSF format and kernel complains: Unable to identify CD-ROM format. I reported this bug a while ago (see bug #1930 on bugzilla) and Andy Polyakov tracked it down. I tried fixing it by myself setting msf_flag (cdrom_read_tocentry) to 0 and removing the MSF to LBA conversions in cdrom_read_toc. It works but I don't have a complete understanding of the code in ide-cd... This is the quick & dirty patch (against 2.6.9, apply with offset to 2.6.10-rc3): Signed-off-by: Andrew Morton --- 25-akpm/drivers/ide/ide-cd.c | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-) diff -puN drivers/ide/ide-cd.c~ide-cd-unable-to-read-multisession-dvds drivers/ide/ide-cd.c --- 25/drivers/ide/ide-cd.c~ide-cd-unable-to-read-multisession-dvds 2004-12-11 22:14:16.629388296 -0800 +++ 25-akpm/drivers/ide/ide-cd.c 2004-12-11 22:14:16.635387384 -0800 @@ -2353,7 +2353,7 @@ static int cdrom_read_toc(ide_drive_t *d /* Read the multisession information. */ if (toc->hdr.first_track != CDROM_LEADOUT) { /* Read the multisession information. */ - stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp, + stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp, sizeof(ms_tmp), sense); if (stat) return stat; } else { @@ -2368,9 +2368,11 @@ static int cdrom_read_toc(ide_drive_t *d msf_from_bcd (&ms_tmp.ent.addr.msf); #endif /* not STANDARD_ATAPI */ - toc->last_session_lba = msf_to_lba (ms_tmp.ent.addr.msf.minute, - ms_tmp.ent.addr.msf.second, - ms_tmp.ent.addr.msf.frame); + toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba); + printk("ide-cd: last_session_lba: %d\n", toc->last_session_lba); +// toc->last_session_lba = msf_to_lba (ms_tmp.ent.addr.msf.minute, +// ms_tmp.ent.addr.msf.second, +// ms_tmp.ent.addr.msf.frame); toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track); _