On Sunday 04 December 2011 19:38, Timothy Murphy wrote:
The "slow disk" [tim@helen ~]$ sudo hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 168 MB in 3.00 seconds = 55.98 MB/sec
Another disk on the same machine [tim@blanche ~]$ sudo hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 146 MB in 3.01 seconds = 48.57 MB/sec
Here are my results with a PATA drive and a SATA drive:
[root@poontang ~]# hdparm -t /dev/hda
/dev/hda: Timing buffered disk reads: 172 MB in 3.02 seconds = 56.97 MB/sec [root@poontang ~]# hdparm -t /dev/sda
/dev/sda: Timing buffered disk reads: 300 MB in 3.01 seconds = 99.66 MB/sec
Your results are similar to what I get with my PATA drive, so I agree with Ho Chaw Ming that you should check that AHCI is selected.