SATA drives. Connect power first.

From: Unkmar 
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Granted, this probably goes without saying.  Connect the power first.
I discovered that connecting the power,  Nothing happens.  Then I connect
the data cable and then the drive spins up.

Lucius L. Hilley III

=============================================================== From: Nick Smith ------------------------------------------------------ Either way you need both ;-)

=============================================================== From: Stephen Kraus ------------------------------------------------------ It uses SCSI serial commands, so yes the drive may not spin up without the data cable. Some drives will because they are ATA drive controllers with a SATA interpreter.

=============================================================== From: John Aldrich ------------------------------------------------------ Quoting Unkmar : Wait... you connect a new drive to a powered-up system???

=============================================================== From: Stephen Kraus ------------------------------------------------------ You can with SATA. Sata supports hot swapping at the hardware level.

=============================================================== From: Unkmar ------------------------------------------------------ Yep, and that is why I wanted SATA so bad when it first come out. You can disconnect them after umount too. Just don't try doing that on a windows system. I don't know if Vista, 7, or 8 handle it. I do know that XP would crap itself. Instant BLUE SCREEN. I've never tried such things with a Mac. I barely touch those things.

=============================================================== From: Nick Smith ------------------------------------------------------ They've always functioned like USB devices for me, can unplug them while the machine is running (linux and mac and most of the time win7)

=============================================================== From: Stephen Kraus ------------------------------------------------------ Yeah, I can pull most SATA drives while Windows and Linux is operational. Varies depending on the drive, but the controller should allow you to do it.

=============================================================== From: John Aldrich ------------------------------------------------------ Quoting Stephen Kraus : Yeah, but still... *shudder* Unless I"ve got a host-swap dock or something specifically designed for that you won't find me trying it. :)