On May 14, 2003, at 5:00 AM, Ceri Davies wrote:

On Tue, May 13, 2003 at 07:02:47PM -0700, David Bear wrote:
I just learned of the new hardware serial ata standard -- much faster
throughput, different form factor, etc.  does freebsd support it now
or does it look enough like standard ata that freebsd doesn't care?

sos already committed support for a promise s-ata controller, making FreeBSD first to support this as far as I'm aware. I don't think that made it to -STABLE yet though.

I haven't tried it on the 4 branch but in 5.2.1 and 5.3-BETA SATA works just fine for me:

ad4: 157066MB <HDS722516VLSA80/V34OA60A> [319120/16/63] at ata2-master SATA150
ad6: 157066MB <HDS722516VLSA80/V34OA60A> [319120/16/63] at ata3-master SATA150

IIRC the SATA spec is downward compatible with PATA so at least in theory a SATA drive and interface will work everywhere.

As for speed and performance claims, "Bah humbug." The initial SATA interface is 150 MB/sec. I've never seen a single drive sustain over 55 MB/sec. so as long as your interface is a bit faster than your hardware then its not an issue. Where the real gains are to be made is with the command set cleanup being undertaken with SATA. Useful multitasking features from SCSI are working their way into the 2nd generation of SATA drives.

SATA uses a nice small cable and connector. Each drive has its own cable without the master/slave silliness so there could/should be a performance increase where one uses both drives at the same time.

Whom computers would destroy, they must first drive mad.

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