View Full Version : [SOLVED] Crucial m4 SSD not operating at SATA-III speeds

September 1st, 2011, 12:54 PM
I'm using a Crucial m4 SSD with an ASUS P8Z68-V motherboard and expected to get read rates above SATA-II speeds (~415MB/s actually), but I don't. They are stuck at ~283MB/s according to palimpsest.

hdparm suggests the drive is recognized as using the SATA-III interface I guess:


Any ideas how to fix this?

I'm using up-to-date Oneiric with kernel 3.0.0-9-generic.

Hm, dmesg output looks bad:

[ 2.534098] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2.534463] ata1.00: ATA-9: M4-CT064M4SSD2, 0009, max UDMA/100
[ 2.534465] ata1.00: 125045424 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
[ 2.534882] ata1.00: configured for UDMA/100
[ 2.535046] scsi 0:0:0:0: Direct-Access ATA M4-CT064M4SSD2 0009 PQ: 0 ANSI: 5

September 1st, 2011, 04:20 PM
So, without my other HDD attached to a SATA-II port, the SSD seems to operate at full speed. Now to find out if that's a kernel or BIOS/controller issue. Oh dear!

September 2nd, 2011, 07:05 PM
I've been trying to reproduce the issue without luck, so I assume it was a connection problem. Very weird, but it's running at SATA-III speed now, seems to be a decent drive: