bruces@jitterbug.berkeley.edu (Bruce Sindahl) (09/28/90)
Help! (please). I've been trying to archive my files to data cartridges and
have been unsuccessful to date. Any experts out there? If so, please read
on... I can use the help.
I've got a 6051 device on which to archive my files using 1/4" tape. The
actual cartridge I've got is the following:
3M DC300XL/P data cartridge, 450 feet (137,2m), 6400 to 10,000 ftpi,
310 oersted tape.
Here's what I've tried.
1.) Just saying "tar -cv dirname". Things look good until I try to
read it back ("tar -tv"), then I get some sort of blocking
error.
Q1: Can I somehow recover this data?
2.) Tried saying "tar -cv -b20 -s450@2400 dirname". Things looked good
until I got along in the directory, then I get a message telling
me that I've run off the end of the tape. I was told that
this particular cartridge can hold 45Meg, but the process never
even got close to that.
Q2: I know that the tape is 450 ft long, so at least the
"450" in "-s450@2400" is correct. Can I specify a
higher density figure than "2400". How do I know
what to use? Can't seem to get any info on this.
Q3: What does ftpi mean, feet per inch. Is this some sort of
specification on how quickly that sucker can spin?
Q4: Any advice on whether I should place the cartridge in the
6051 cold or let it warm up for a time. The thing
gets real hot (can't even touch the metal plate on the
bottom) if it sits in there for a while. Is this
normal, or is my 6051 flaking out?
Could sure use some help on this. Please e-mail direct and I'll post the
results if there's interest, thanks. jtkohl@MIT.EDU (John T Kohl) (09/28/90)
In article <28296@pasteur.Berkeley.EDU> bruces@jitterbug.berkeley.edu (Bruce Sindahl) writes: > Q3: What does ftpi mean, feet per inch. Is this some sort of > specification on how quickly that sucker can spin? I'm told FTPI is "field transitions per inch", which is (apparently) some measure of the quality of the tape to hold high-density encodings. John -- John Kohl <jtkohl@ATHENA.MIT.EDU> or <jtkohl@MIT.EDU> Digital Equipment Corporation/Project Athena (The above opinions are MINE. Don't put my words in somebody else's mouth!)