Thats disappointing as many people I know use ubuntu on older hardware
for media servers and currently have over 1TB of PATA disk attached to
mine (Lossless audio streaming and photography).  While I dont use mine
for DVD playback, the performance hit for PATA disk is too severe and
have reverted back to Edgy (6.10) until this issue is fixed as I cant be
bothered manually maintaining a custom kernel.  I must say I am a little
surprised at the lack of urgancy being shown given the number of non-
sata laptops ubuntu is used on.  In my case the performance of my PATA
drives on my AMD 1.8 system dropped from 60+MB/sec to barely 5MB/sec and
is very obvious when you routinely move large volumes of data around
over GigE.  Now I am back on Edgy, all is good performance wise and can
sustain 30MB/sec using samba again:

Linux jupiter2.home.net 2.6.17-10-server #2 SMP Tue Dec 5 22:29:32 UTC 2006 
i686 GNU/Linux
[EMAIL PROTECTED]:~# hdparm -tT /dev/hda

Edgy
====
/dev/hda:
 Timing cached reads:   1220 MB in  2.00 seconds = 608.88 MB/sec
 Timing buffered disk reads:  182 MB in  3.03 seconds =  60.15 MB/sec

Feisty (same disk)
=====
/dev/hda:
 Timing cached reads: 596 MB in 2.00 seconds = 297.85 MB/sec
 Timing buffered disk reads: 16 MB in 3.15 seconds = 5.09 MB/sec

-- 
hdparm - cannot set dma on IDE hard drive that works via pata
https://bugs.launchpad.net/bugs/110636
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