I have the same problem:
My setup:
* Gigabyte P35 motherboard
* 1 WD 500G IDE drive
* 1 Seagate 500G SATA drive
hdparm ("hdparm -tT") gives 2966/109 MB/sec (cached and buffered reads)
for the SATA-drive and 3026/74 MB/sec for the IDE-drive. No problem
there.
In Windows XP there is no problem with either drive. Both are fast
(~30-40 MB/sec).
Here are the tests I've done:
* Reading from the IDE-drive is fast (+30 MB/sec)
* Writing to the IDE-drive is fast (+30 MB/sec)
* Reading from the SATA drive is SLOW (~3.5 MB/sec)
* Writing to the SATA drive is fast (+30 MB/sec)
I've done these tests on two partitions of the SATA-drive, and using
both FAT32 and ext4.
--
Slow SATA performance
https://bugs.launchpad.net/bugs/119730
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