Zitat:
To
access USB storage devices, the operating system sends SCSI commands through the USB transport to the device. If the USB device is actually a PATA or SATA disk in an USB enclosure, the firmware of its USB bridge chip translates these commands into the corresponding ATA commands. This works straightforward for read and write commands, but not for SMART commands.
To
access SMART functionality, smartmontools must be able to send ATA commands directly to the disk. For USB devices, at least the following conditions must be met:
* The USB bridge provides an ATA pass-through command.
* This command is supported by smartmontools.
* The operating system provides a SCSI pass-through I/O-control which works through its USB-layer.
* SCSI support is implemented in the operating system interface of smartmontools.
Some recent USB bridges already support the vendor independent SAT (SCSI/ATA Translation,
ANSI INCITS 431-2007) standard. Other USB bridges provide vendor specific ATA pass-through commands. The current version of smartmontools supports the following pass-through commands and USB bridges:
http://sourceforge.net/apps/trac/smartmontools/wiki/USB