>> I have a Sun-3/150 with an si interface and a Seagate ST15230N,
>> which is about 4Gb, and it works just fine.  It can access the whole
>> disk with no apparent problems.
> Have you got any partition larger than 1Gb?

Yes.  Two of them.  disklabel prints the partition table as

8 partitions:
#        size   offset    fstype   [fsize bsize   cpg]
  a:    37050        0    4.2BSD     1024  8192    16   # (Cyl.    0 - 24)
  b:   222300    37050      swap                        # (Cyl.   25 - 174)
  c:  8383674        0   unknown                        # (Cyl.    0 - 5656)
  d:    37050   259350    4.2BSD     1024  8192    16   # (Cyl.  175 - 199)
  e:    37050   296400    4.2BSD     1024  8192    16   # (Cyl.  200 - 224)
  f:   148200   333450    4.2BSD     1024  8192    16   # (Cyl.  225 - 324)
  g:  3951012   481650    4.2BSD     1024  8192    16   # (Cyl.  325 - 2990)
  h:  3951012  4432662    4.2BSD     1024  8192    16   # (Cyl. 2991 - 5656)

This is actually a NetBSDified SunOS disk label; the SunOS label looks
like this:

sunlabel> p
a: start cyl =      0, size =    37050 (25/0/0 - 18.0908Mb)
b: start cyl =     25, size =   222300 (150/0/0 - 108.545Mb)
c: start cyl =      0, size =  8383674 (5657/0/0 - 4093.59Mb)
d: start cyl =    175, size =    37050 (25/0/0 - 18.0908Mb)
e: start cyl =    200, size =    37050 (25/0/0 - 18.0908Mb)
f: start cyl =    225, size =   148200 (100/0/0 - 72.3633Mb)
g: start cyl =    325, size =  3951012 (2666/0/0 - 1929.21Mb)
h: start cyl =   2991, size =  3951012 (2666/0/0 - 1929.21Mb)
sunlabel> l
ascii: ST15230N cyl 5657 alt 2 hd 19 sec 78
rpm: 0          pcyl: 0         apc: 0          obs1: 0
obs2: 0         intrlv: 1       ncyl: 5657      acyl: 0
nhead: 19       nsect: 78       obs3: 0         obs4: 0
sunlabel> q

					der Mouse

			    mouse@collatz.mcrcim.mcgill.edu