[RoLUG] hd ata66 che va a 33

[confrey]

Sono ancora io, pensavo di aggiungere un etsratto del dmesg, relativo
alle periferiche ide :

NET: Registered protocol family 1
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
SIS5513: IDE controller at PCI slot 0000:00:02.5
SIS5513: chipset revision 208
SIS5513: not 100% native mode: will probe irqs later
SIS5513: SiS635 ATA 100 (2nd gen) controller
    ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hda:DMA, hdb:DMA
    ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdc:DMA, hdd:DMA
hda: ST36422A, ATA DISK drive
hdb: Hewlett-Packard CD-Writer Plus 9300, ATAPI CD/DVD-ROM drive
Using anticipatory io scheduler
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: max request size: 128KiB
hda: 12500460 sectors (6400 MB) w/256KiB Cache, CHS=13228/15/63,
UDMA(33)
/dev/ide/host0/bus0/target0/lun0: p1 p2
hdc: QUANTUM FIREBALLlct10 10, ATA DISK drive
ide1 at 0x170-0x177,0x376 on irq 15
hdc: max request size: 128KiB
hdc: 20044080 sectors (10262 MB) w/418KiB Cache, CHS=19885/16/63,
UDMA(33)
/dev/ide/host0/bus1/target0/lun0: p1 p2 p3

ecco, che significa "SIS5513: not 100% native mode: will probe irqs
later" ? 
inoltre si evince che il quantum viene visto come un ata33, mentre è un
ata66, con cavo a 80 pin; le prestazioni non sono disprezzabili, ma non
so se siano allineate con lo standard 33 o 66.

Ringrazio fin d'ora per eventuali chiarimenti..
Ciao

confrey