Oddness in ahcisata driver

[M Graff <explorer%flame.org@localhost>]

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Last night, I decided it was finally time to murder Vista and install
NetBSD on a new machine I have.  Unfortunately, for any support
whatsoever, I need to have Vista there too, so when/if a tech has to
stop by the office they can run their expected diagnostics.  Lame, but
unavoidable.

Ignoring that the "os recovery" CD Gateway shipped wipes the whole disk
to remove any "errors" -- and any other OSs -- I managed to get both
installed by wiping the MBR from the NetBSD install disk with dd,
"recovering" Vista, and then using disk manager to "shrink" Vista down
by 150 GB.  NetBSD installed (with minor nits) easily.

However, and this is the oddness, I had to put the 500 GB disk I wanted
to install on channel 1, and my other disks on channels 2 and 3.  If I
put the 500 GB disk on channel 0 it would probe as a ST506 drive and
report double-digit MB size.  NetBSD reports it as using chs addressing
as well on channel 0.

Moving it to SATA channel 1 "fixed" this.

ahcisata0 at pci0 dev 31 function 2: Intel 82801GB/GR AHCI SATA Controller
ahcisata0: interrupting at ioapic0 pin 19 (irq 10)
ahcisata0: AHCI revision 1.1, 4 ports, 32 command slots, features 0xc320e000
atabus3 at ahcisata0 channel 0
atabus4 at ahcisata0 channel 1
atabus5 at ahcisata0 channel 2
atabus6 at ahcisata0 channel 3
wd0 at atabus4 drive 0: <WDC WD5000AAKS-00TMA0>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 465 GB, 969021 cyl, 16 head, 63 sec, 512 bytes/sect x 976773168 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(ahcisata0:1:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6
(Ultra/133) (using DMA)
wd1 at atabus5 drive 0: <ST3300620AS>
wd1: quirks 2<FORCE_LBA48>
wd1: drive supports 16-sector PIO transfers, LBA48 addressing
wd1: 279 GB, 581421 cyl, 16 head, 63 sec, 512 bytes/sect x 586072368 sectors
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd1(ahcisata0:2:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6
(Ultra/133) (using DMA)
wd2 at atabus6 drive 0: <ST3320620AS>
wd2: quirks 2<FORCE_LBA48>
wd2: drive supports 16-sector PIO transfers, LBA48 addressing
wd2: 298 GB, 620181 cyl, 16 head, 63 sec, 512 bytes/sect x 625142448 sectors
wd2: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd2(ahcisata0:3:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6
(Ultra/133) (using DMA)
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