Mandriva2007 + SATA винт = тормоза, где грабли?

Дано:
# hdparm /dev/sda

/dev/sda:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 24321/255/63, sectors = 390721968, start = 0

# hdparm -c1 /dev/sda

/dev/sda:
setting 32-bit IO_support flag to 1
HDIO_SET_32BIT failed: Invalid argument
IO_support = 0 (default 16-bit)
[root@GhostDragon ~]# hdparm -d1 /dev/sda

# hdparm -d1 /dev/sda

/dev/sda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Inappropriate ioctl for device

Гугл какогото внятного ответа не дал, куда копать?