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authorDavid Zeuthen <davidz@redhat.com>2011-03-30 08:11:03 -0400
committerDavid Zeuthen <davidz@redhat.com>2011-03-30 10:28:24 -0400
commit42b9482ab2da64b4c2f254c227c0efaf83988a84 (patch)
tree621d833e991ad7eeaae929a2f5b37dd7e75dafed /README
parenta138cd07145519f30226e06d41b0a11b50864658 (diff)
Run ata_id on non-removable USB devices
If a USB device is marked as removable, it is often a SATA/PATA disk in an enclosure (note that flash card readers and usb storage sticks are always marked as removable). In this case, try running ata_id (which sends ATA commands wrapped in SCSI ATA PASS THROUGH commands) to get information about the disk. If this fails, just fall back to running usb_id since it could be the device isn't an ATA device at all or the device doesn't have a SAT layer. This extra information is nice to have as it indicates if it is suitable to send e.g. SMART commands to the disk, whether the disk supports power management and so on. Additionally, the VPD and serial number returned by ata_id is usually more accurate as it stems from the disk itself instead of the enclosure. Note that udisks has been doing this for a while KERNEL=="sd*[!0-9]", ATTR{removable}=="0", ENV{ID_BUS}=="usb", ENV{DEVTYPE}=="disk", IMPORT{program}="udisks-probe-ata-smart $tempnode" so this change shouldn't be too disruptive (udisks-probe-ata-smart also sends ATA commands via the ATA PASS THROUGH command). Signed-off-by: David Zeuthen <davidz@redhat.com>
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