Hello, Chuck. Chuck Ebbert wrote: > The other machine has what seems to be a "real" SATA DVD writer in it. > It reports udma5 as the connect speed. This one seems to be a PATA drive > with an internal SATA bridge and is connecting as mwdma2. Ah... that makes sense. libata has problem with ATAPI devices connected over a SATA-PATA bridge. Albert Lee tried to track it down a while ago but it never got resolved. :-( Tracking things like this can be quite difficult. Eh... having SATA tracer would be nice. Oh well... >>> ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen >>> ata2.00: cmd a0/01:00:00:00:02/00:00:00:00:00/a0 tag 0 dma 512 in >>> cdb a1 08 2e 00 00 00 00 00 40 ec 00 00 00 00 00 00 >>> res 40/00:02:00:08:00/00:00:00:00:00/a0 Emask 0x4 (timeout) >>> ata2.00: status: { DRDY } >>> ata2: hard resetting link >>> ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300) >>> ata2.00: configured for MWDMA2 >>> ata2: EH complete >> Here, BLANK has timed out but the device was recovered okay. >> > > I ran 'hdparm -I' here. Why would it send BLANK to the drive?? > (There was a 1.4 GB DVD-RW in the drive when I did that.) CDB 0xa1 is BLANK alright. Is the problem reproducible? > Also there is no "applying bridge limits" message here when it resets > like there is when the system boots. > >>> sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK >>> sr 1:0:0:0: [sr0] Sense Key : Illegal Request [current] >>> sr 1:0:0:0: [sr0] Add. Sense: Logical block address out of range >>> end_request: I/O error, dev sr0, sector 0 >> And after that, the media can't be read, so this one seems normal. >> > > The media wasn't blanked -- rebooting lets me read it again. > > Also, running 'hdparm -I' with no disk in the drive outputs: > > /dev/sr0: > HDIO_DRIVE_CMD(identify) failed: Invalid exchange > > And strangely enough, I get the same message with a normal DVD disk in > the drive too... :-( -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html