spindown on USB enclosures with Cypress chip
Hi,
regarding to USB enclosures with Cypress chipset, there might be a chance with following command:
/usr/local/sbin/scsi-start 0 --pc=2 /dev/scsi/host0/bus0/target0/lun0/disc
if someone has the knowledge how to program USB access, there is a special feature in the Cypress chips to pass-through ATA commands. Details are in the AT2LP rev C datasheet might be only a few lines of code for a pro....
also the chip has a register for setting autom. spindown value on ATA-initialisation, but I never got it to work....
schufti
Spindown via cypres-usb chipset
I did some experimenting:
using my pc (ubuntu feisty fawn), I was not able to spin down the harddisk with the scsi-tools either (just as under kamikaze on a wl-500gP).
the lsusb output of the external HD is:
ID 04b4:6830 Cypress Semiconductor Corp. USB-2.0 IDE Adapter
Using the sg3-utils of ubuntu (http://sg.torque.net/sg/sg3_utils.html)
i did manage to make the disk spin down (but it didn't spin up until
after a reset of the drive)
I'm now trying to make a package out of it, but haven't finished yet.