Re: How to check whethera disk supports 32-bit IO

query wrote:

>     I want to know enable 32-bit IO-support on my SATA hard drive
> using hdparm . But before I enable 32-bit support , I want to know
> whether my hard drive supports 32-bit IO or not.

The term "32-bit I/O" relates to communication between the CPU and a
PCI IDE controller. The concept isn't meaningful for an on-board
controller.

As for communication between the controller and the drive, a parallel
ATA interface is 16-bit, while SATA is serial.

> 	   *	48-bit Address feature set
> (is it telling that the disk supports 48-bit IO)

No, it's stating that the drive supports 48-bit LBA addresses. The
original IDE standard used 28-bit addresses which limit the size of
the drive to 137GB (2^28 512-byte sectors).

-- 
Glynn Clements <[email protected]>