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SATA - PATA, "native" - "legacy" (Announce)

posted by RayeR Homepage, CZ, 18.12.2007, 02:03

> Yes. Might be one of the "El Cheapos". Does this difference occur in both
> v86-mode AND real-mode?
Hey you Cheapo ;-), I made some further tests. I tried all modes AHCI/RAID/IDE with and without UDMA.SYS. BTW I was surprised that even AHCI and RAID modes are still working in DOS, I though it's some kinda windoze or "need a driver" only.

Another surprise that in RAID mode I reached much higher speed without UDMA.SYS (but then UDMA.SYS cannot be used because don't understand the controller):

Writting average speed: 13.992 MB/s
Reading average speed: 31.270 MB/s

It's probably due to RAID BIOS ROM module with its own INT13h services is loaded instead built-in standard one and it uses DMA. It works also with JEMM.
I got similar result with ITE8211 under DOS. But who wants to let useless RAID BIOS to occupy UMB? Rather use smaller UDMA.SYS and IDE mode.

BTW I also did some benchmark with HDTune under XP and found that AHCI SATAII mode brings only very very small performance gain over IDE mode, in both cases I got ~85MB/s.

---
DOS gives me freedom to unlimited HW access.

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