Download your favorite Linux distribution at LQ ISO.
Go Back > Forums > Linux Forums > Linux - Distributions > Ubuntu
User Name
Ubuntu This forum is for the discussion of Ubuntu Linux.


  Search this Thread
Old 03-27-2007, 03:20 PM   #1
Registered: Jan 2004
Location: cheshire, uk
Distribution: Ubuntu Hoary
Posts: 605

Rep: Reputation: 33
Ubuntu Feisty ATA hard drive now appears as SCSI

Hi all,

I've recently completed a fresh install of Ubuntu Feisty Beta on my laptop. Whereas previously my hard drive and DVD-RW appeared as IDE devices (/dev/hda, /dev/hdd), they now appear as SCSI devices (/dev/sda, /dev/scd0).

This wouldn't be a problem, but video playback is now appallingly choppy, which would tend to suggest some sort of DMA problem. I don't think I can use hdparm with SCSI drives, so does anyone have any ideas?

The laptop is a Celeron 2GHz machine, with Intel chipset (815, I think).

If you need any further info, please let me know.

Many thanks!
Old 03-27-2007, 04:40 PM   #2
Registered: Apr 2005
Distribution: Exherbo
Posts: 474
Blog Entries: 1

Rep: Reputation: 32
Yes, the reason that your ATA drive shows up as SCSI is because, technichally, it is a SCSI device now. Starting with linux kernel version 2.6.19 all ATA drivers are under libata, which appear as /dev/sdX. Now, for backwards compatibility, you can still use the old ATA drivers, but the Ubuntu devs decided(somewhat smart, somewhat stupid, but needs to be done eventually) that for feisty it would use the new drivers.

I have some features of my SATA drives that work with hdparm, but some that don't. Try it out, because it might *just work*
Old 03-27-2007, 06:02 PM   #3
Registered: Jan 2004
Location: cheshire, uk
Distribution: Ubuntu Hoary
Posts: 605

Original Poster
Rep: Reputation: 33
OK, many thanks for that - it clears up some of my confusion. The only thing is, I'm not very familiar with low-level stuff such as IDE / SCSI! To the extent that I don't even know what to google / search for. Anyway, what might I need to do to improve performance? I'm familiar with hdparm, and I believe there's also an equivalent sdparm utility, but it all seems to fly in the face of the Ubuntu 'just works' philosophy (yeah, I've been cossetted by this for the past couple of years!) Thanks again


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to mount a SCSI hard drive through a PCI SCSI card. jesuscakes Linux - Hardware 1 06-09-2006 04:28 PM
HP Omnibook 6000 Hard drive interface: ATA-100 or ATA-6? shortname Linux - Laptop and Netbook 3 05-11-2005 09:22 PM
ATA Hard Drive??? tricky_linux Linux - Hardware 2 09-19-2003 08:42 PM
help. ATA/SCSI Serial-ATA error: "ATA: Abnormal Status" xin Linux - Hardware 10 09-05-2003 10:59 PM
ATA Hard Drive Preference no1zhome General 16 04-17-2002 02:40 PM > Forums > Linux Forums > Linux - Distributions > Ubuntu

All times are GMT -5. The time now is 09:04 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration