Sata disk with 16 bit IO_support
Felipe Alfaro Solana
felipe.alfaro at gmail.com
Tue Sep 26 23:37:49 UTC 2006
On 9/26/06, Joan Tur <joantur at cancullet.org> wrote:
> Es Dimarts, 26 de Setembre de 2006 21:31, en Felipe Alfaro Solana va escriure:
> | On 9/26/06, Joan Tur <joantur at cancullet.org> wrote:
> | > Hallo!
> | >
> | > My brand new laptop (LG LW20) has got a 1,8" sata disk drive; I've
> | > installed Kubuntu 6.06.1 in it, and have noticed that IO_support was 0
> | > (16 bit), instead of 1 (32 bit).
> | >
> | > Running "hdparm -c1 /dev/sda" shows "HDIO_SET_32BIT failed: Invalid
> | > argument"
> | AFAIK, most of the tunables of hdparm are useless for SATA controllers
> | (only for PATA controllers). Anyways, you can be pretty sure you're
> | using 32-bit access, bus-master transfers to and from your hard disk,
> | since almost all SATA controllers do support bus-master and are based
> | on PCI or PCI-Express bus designs (not ISA).
> I think you're wright, as I get about 18MB/s transfer rates from hdparm.
Is that a laptop SATA disk? 18MB/s seems a little bit slow for a SATA drive.
I've a couple of desktop ATA100 disks that sustain transfers at about
40MB/s and I've seen SATA disks getting into 50MB/s or even more.
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