[Info-vax] TLZ7

[AEF]

On Nov 4, 11:44 am, AEF <spamsink2... at yahoo.com> wrote:
> On Nov 4, 11:12 am, m.krae... at gsi.de (Michael Kraemer) wrote:
>
>
>
> > In article <iaugng$18n... at ns.felk.cvut.cz>, smithfarm <presnyprek... at gmail.com>
> > writes:
>
> > > > 2GB uncompressed makes it a TLZ04, DDS-1. TLZ07 does 4GB uncompressed
> > > > and is DDS-2. Some inconsistency here, not sure who to believe. The
> > > > hardware is usually definitive.
>
> > > Is the only way to tell DDS1 from DDS2 (definitively, from the hardware)
> > > to attempt to write more than 2GB to a DDS2 tape and see what happens?
> > > Or is there another way?
>
> > What puzzles me is the date "December 13, 1985"
> > which is definitely much earlier than DDS-2 technology.
> > If it really is a TLZ07, i.e. a DDS-2 drive,
> > it will only take DDS-2 and DDS-1 media, no DDS-3 and above.
> > It's not only tape length, but also write density.
> > The higher capacity media have thinner tapes
> > (probably to fit them into the same cartridge size),
> > and so may even be torn apart when used in an older drive.
> > Modern drives have media recognition and will spit out
> > "wrong" tapes.
>
> I strongly recommend to NOT use DDS-2 tapes on a TLZ07. (BTW, mine
> don't look anything like yours.) I had endless trouble reading DDS-2
> tapes on these drives. They'd either get the parity error part way
> through the tape, or not read at all. This is usually when you try to
> read the tape on a different drive.
>
> Use DDS-1. Once I started using that, everything worked as it should.
>
> Of course it may be something about MY TLZ07s. Don't know. (Not DEC,
> but we had HP maintenance on them, and some of the drive they sent as
> substitutes were no better! On spit out a tape onto the floor. (I am
> not making this up.) A tiny screw fell out of another (after I heard
> it rattling when carrying the drive).

Correction: They're DEC drives. The SW slide-ins look so
generic. . . . Silly me.

>

aef