[EMAIL PROTECTED] wrote:
>
> I went through this problem a while ago. Turns out that the DAT drives are
> helical. This means that the *effective* length of the tape is calculated
> based on the density of a helical stripe on the tape multiplied by the
> number of stripes that fit on the tape.
>
I think this may only be true for MRS tapes (media regognition system)
tapes.
There are also tapes that don't have the MRS diagonal marks that do work
as well.
> [What the hell is he talking about?]
>
> What he's saying is that the 4 & 8mm drives work like a VHS VCR. the read &
> write heads *fly* across the tape diagonally instead of along its length (like a
> cassette, remeber those?) which means that he calculated the *length* of the
> tape as far as dump is concerned as being the physical length of the tape (90 or
> 120 meters) times the width of the tape (4 or 8 mm) divided by the width of the
> tracks ---
>
> a cassette records as follows ------------------------------------------------
> a helical recordslike this
> ////////////////////////////////////////////////
>
> so for the same physical length of tape you get more data on the tape.
>
> I'm sure that is clear as mud but... I tried
>
> -- Ken
>
> --
> To unsubscribe: mail [EMAIL PROTECTED] with "unsubscribe"
> as the Subject.
--
====================================================================
Bruce Kall
Mayo Foundation
Rochester, MN
e-mail: [EMAIL PROTECTED]
phone: (507) 255-4768
====================================================================
--
To unsubscribe: mail [EMAIL PROTECTED] with "unsubscribe"
as the Subject.
