sgren@dynas.se (Johannes Sjogren) (11/12/90)
I have successfully reformatted my old MFM drive (Seagate ST251-1) with
my new RLL 1:1 controller. It all seems to works quite well. In fact it works
almost too well...
During the badtrack scan only one of the 25 tracks listed on my
badtrack list was found. Is this normal? Is it possible for the controller
to correct worse errors when using RLL than with MFM?
(When I formatted it with an MFM controller all the 25 tracks were found)
To make sure I won't get any unpleasant surprises later I would like to enter
the badtracks not found by the media scan.
Unfortunatelly my bad track list only lists Head, sector and "MBFI".
How do I translate this MBFI (MFM Byte Offset from Index?) value to an
RLL Byte Offset value ("RBFI"?) ?
/Johannes
--
Johannes Sjogren sgren@dynas.se
DynaSoft, Dynamic Software AB Phone: +46-8-726 85 60
Liljeholmsv 10, S-117 43 STOCKHOLM, SWEDEN Fax: +46-8-18 11 45davidsen@sixhub.UUCP (Wm E. Davidsen Jr) (11/14/90)
There is no perfect mapping, since the sectors and gaps fall in
diferent places, and a spot which will not hold data may be in a gap
where you can "luck out" and never see it.
I would run verify on the drive (from the controller BIOS) and then
take what you get. There's no really good way I've found to be sure you
have the right thing.
This goes double if you are using the various skews which add so much
to performance on large file!
--
bill davidsen - davidsen@sixhub.uucp (uunet!crdgw1!sixhub!davidsen)
sysop *IX BBS and Public Access UNIX
moderator of comp.binaries.ibm.pc and 80386 mailing list
"Stupidity, like virtue, is its own reward" -me