mt command questions

[Lowell Gilbert]

Sean Murphy <smurphy at calarts.edu> writes:

> I am learning about backing up to tape and have made quite a bit of
> progress with the mt command.  I understand what the fsf option does.
> There are other options however and would like to understand them as
> well.  I am looking at the man page and have tried googleing them with
> not a lot of luck.  the fsr and fss options I understand they would
> fast forward but what is "count records" and "count setmarks"
> considered and how would I use them?

In this context, "count" is a number. 
I haven't used mt(1) in quite a while, but I don't think I ever used
more than one of {files, records, setmarks} on the same tape,
andoffhand I can't think of a reason for doing so.  If you only put
one backup on a given tape, you wouldn't use any of them.