SATA 300 Drive Being Run At 150

Marc G. Fournier freebsd at
Sun Jul 22 03:10:15 UTC 2007

Hash: SHA1

- --On Saturday, July 21, 2007 11:55:39 -0500 Dan Nelson 
<dnelson at> wrote:

> In the last episode (Jul 21), Tim Daneliuk said:
>> I asked this question a while back, but needed to do more digging to make
>> sure I had latest sources etc.
>> I have an Intel motherboard that shows this for a SATA controller:
>> atapci1: <Intel ICH7 SATA300 controller> port
>> 0x20c8-0x20cf,0x20ec-0x20ef,0x20c0-0x20c7,0x20e8-0x20eb,0x20a0-0x20af mem
>> 0x90204000-0x902043ff irq 19 at device 31.2 on pci0
>> But the hard drive - a SATA 300 device - shows up like this:
>> ad4: 238475MB <WDC WD2500JS-00NCB1 10.02E02> at ata2-master SATA150
>>                                                             ^^^^^^^
>> Using dd, I have confirmed that the drive is running nowhere near
>> SATA-III speeds, at least on reads:
>> 968470075 bytes transferred in 7.132891 secs (135775249 bytes/sec)
> What was your dd commandline?  If you've got more than 1GB of RAM and
> tested by reading a file and not the raw device itself, you just tested
> FreeBSD buffer cache. According to
> , that
> drive's maximum sustained speed is only 93.5 MB/sec, so it doesn't
> really matter if your interface is running at SATA150 or SATA300 unless
> you plan on reading exclusively from its 8MB buffer :)

'k, I just bought a new desktop, SATA/300MB/s interface, and this drive:


Web site states 3Gb/s ... I'm seeing same SATA!50:

atapci0: <JMicron JMB361 SATA300 controller> port 
0xbf00-0xbf07,0xbe00-0xbe03,0xbd00-0xbd07,0xbc00-0xbc03,0xbb00-0xbb0f mem 
0xfdbfe000-0xfdbfffff irq 16 at device 0.0 on pci2
atapci1: <Intel ICH8 SATA300 controller> port 
irq 19 at device 31.2 on pci0
atapci2: <Intel ICH8 SATA300 controller> port 
irq 19 at device 31.5 on pci0
ad8: 152627MB <WDC WD1600AAJS-08PSA0 05.06H05> at ata4-master SATA150

Latest 6.x STABLE ...

- ----
Marc G. Fournier           Hub.Org Networking Services (
Email . scrappy at                              MSN . scrappy at
Yahoo . yscrappy               Skype:        ICQ . 7615664
Version: GnuPG v1.4.5 (FreeBSD)


More information about the freebsd-questions mailing list