Can anyone think of a reason for exactly 0x400 contiguous bytes (0x1000-0x13ff)
of a 1Gb file (1024^3 bytes) (postgresql database) to be replaced by a bit
of my /var/mail/prlw1 (often mmapped by mutt)? It (i386) ran a 17 Sept kernel
for a day, and 18 Sept ever since. I think the corruption happened on the
17th. The disk is

wd0 at pciide0 channel 0 drive 0: <Maxtor 7Y250P0>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 233 GB, 486344 cyl, 16 head, 63 sec, 512 bytes/sect x 490234752 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA data transfers)

I didn't see any real candidates in source-changes of 17/18th.. (Not SATA, no
unionfs) It's ffs with softdeps. Is assuming "duff drive" an option?

Cheers,

Patrick