use 64-bit counters; useful for scanning disks for silent
write errors after writing a pattern to the disk.  example:
; dd -if /dev/zero -of /dev/sdE0/data -bs 512k
1907349+0 records in
1907348+1 records out
; dd -if /dev/sdE0/data -bs 1024k -count 3000 | `{yesterday /386/bin/freq}
3000+0 records in
3000+0 records out
  0 000 00 - -1149239296
; dd -if /dev/sdE0/data -bs 1024k -count 4500 | freq
4500+0 records in
4500+0 records out
  0 000 00 - 4718592000