Date: Sat, 4 Jul 1998 15:28:37 +0200 (MET DST) From: Willem Jan Withagen <wjw@surf.IAE.nl> To: hackers@FreeBSD.ORG Cc: scsi@FreeBSD.ORG Subject: Re: Apollo tapes (was: Variant Link implementation, continued) Message-ID: <199807041328.PAA26905@surf.IAE.nl> In-Reply-To: <199807030025.TAA18925@nospam.hiwaay.net> References: <wjw@surf.IAE.nl>
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In article <199807030025.TAA18925@nospam.hiwaay.net> you write:
>Willem Jan Withagen writes:
>> You ( David Kelly ) write:
>> => For dd its "conv=swab".
>> =>
>> => To duplicate your tapes use tcopy(1) if you have two tape drives. Tcopy
>>
>> Well I can't even dd them of either tape. So I've haven't een gotten into
>> data incompatibility issues
>> Julian suggested RTFM 'mt blocksize'. Which I'll as soon as I reboot to
>> get the tape operational on my FreeBSD box.
>
>They were written on 4mm DAT? Not something weird like QIC-100? Saw an
>HP "development system" which wrote QIC-100 format to DC-6150 tapes, I
>think. Tapes had to be formatted. Then they mounted like a filesystem.
>Slower than a tax refund.
>
>In the early bad old days of DAT (more correctly known as DSS) there
>were more problems than there should have been with one tape drive not
>being able to read tapes from another, all other things the same.
Oke, My drive is again on line:
[~] wjw@digi> mt stat
Present Mode: Density = X3B5/88-185A Blocksize variable
---------available modes---------
Mode 0: Density = 0x00 Blocksize variable
Mode 1: Density = X3.136-1986 Blocksize = 512 bytes
Mode 2: Density = X3.39-1986 Blocksize variable
Mode 3: Density = X3.54-1986 Blocksize variable
looking at: man mt:
The different density codes are as follows:
0x0 default for device
0xE reserved for ECMA
Value Tracks Density(bpi) Code Type Reference Note
........
0x13 1 61000 DDS CS X3B5/88-185A 4
0x14 1 43245 RLL CS X3.202-1991 4
0x15 1 45434 RLL CS ECMA TC17 4
Which are 3 DAT formats. And thus it is a DDS-coded tape.
And thus:
How do I read this tape on a:
(ncr0:6:0): "HP HP35480A T603" type 1 removable SCSI 2
st0(ncr0:6:0): Sequential-Access
I've tried:
mt density 0x13
but that buys me very little
st0(ncr0:6:0): COMMAND FAILED (4 88) @f0697400.
st0(ncr0:6:0): COMMAND FAILED (4 88) @f0697400.
st0(ncr0:6:0): Deferred Error: MEDIUM ERROR asc:3b,0 Sequential positioning
error
Anybody with more suggestions?? (other than finding the "old" tapedrive)
--WjW
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