====== 4.3BSD UWISC "newfs: ra81: no default block size for `c' partition" fix ======
When partitioning slice c of an RA81 disk under 4.3UWISC, you will get the following error: 

''newfs: ra81: no default block size for `c' partition''

Despite ''/etc/disktab'' appearing complete, this error is unavoidable. In order to properly partition an RA81 run the following command:

<code>/etc/mkfs /dev/rra0c 891072 51 14 4096 512 16 10 60 2048 t
#         special    size [ nsect ntrak bsize fsize cpg minfree rps nbpi ]</code>

This can be retrieved using ''newfs -v special'' when newfs fails in this way. 

It is likely this could also be used to circumvent whatever issue is causing the ''write error: 759667'' error when installing to an RA81.