Here's a transcript:

# newfs /dev/rwd0a
With 16065 sectors per cylinder, minimum cylinders per group is 64
This requires the block size to be changed from 8192 to 32768
	and the fragment size to be changed from 1024 to 4096
# newfs -b 32768 -f 4096 /dev/rwd0a
Warning: cylinder groups must have a multiple of 64 cylinders
Warning: insufficient space in super block for
 rotational layout tables with nsect 63 and ntrak 255.
File system performance may be impaired.
Warning: 5 sector(s) in last cylinder unallocated
/dev/rwd0a:     80320 sectors in 5 cylinders of 255 tracks, 63 sectors
        39.2MB in 1 cyl groups (64 c/g, 502.03MB/g, 2560 i/g)
super-block backups (for fsck -b #) at:
 64,
#

What does this mean? Is it ok to just ignore the warnings or should I
be worried? "File system performance" sounds a bit worrying...

This is on NetBSD/i386-current, the disk is a 6GB IDE disk used with
LBA addressing which gives it a geometry of 790/255/63
(cylinders/heads/sectors).  Since I'd like to dual-boot this box I
guess I have to use this geometry to be able to have both Windows and
the NetBSD root partition inside 1024 cylinders (the native geometry
says 12592 cylinders!).

Any help appreciated,

	-- Urban

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