Trying to "tar" to tape stream (6051) device

Thread View: comp.sys.ibm.pc.rt

2 messages

[T] Back to Threads [V] Tree View [G] Group Articles

2 total messages Started by Bruce Sindahl Fri, 28 Sep 1990 01:55

#896

Author: Bruce Sindahl
Date: Fri, 28 Sep 1990 01:55

39 lines
2137 bytes

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.

Re: Trying to "tar" to tape stream (6051) device

#898

Author: John T Kohl
Date: Fri, 28 Sep 1990 15:21

13 lines
1117 bytes

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!)

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads