Armin Schulz wrote:
> Hi Frank,
>
> Frank Slootweg wrote:
>
>> Why would you need to format a DDS [1] tape? A DDS tape does not have
>> to be low-level formatted. The LLF is written by the drive while the
>> high-level-format/data format is written by the backup/archive program
>> in question.
>>
>
> I want to sell drive and tapes and want to assure that all the data are
> erased.
You can rewind the tape, then write anything to the tape, such as a filemark.
Any data beyond what was written is inaccessible by normal means. It's a
moderate level of security. On a linux system, you could dd /dev/zero to the
tape device file, which would be very good security. You can also use
a bulk tape eraser, but that erases some low-level logs on the tape. It's
not fatal, but less desirable.
Tapes have a very limited lifetime, I frankly wouldn't buy a used DDS1 tape.
Or 2, or 3. Or a used tape drive, either.
>
>> [1] "DAT" is Digital-Analog Tape and is only used for recording sound.
>> DDS is Digital Data Storage and is used for use with computers and such.
>> You should not use a DAT tape in a DDS drive (like the 35470A).
>
> Sorry, I was inexact. I mean DDS-tapes. Colloquial I know the tape
> "DDS-drives" by "DAT-drives".
They're the same tapes. The DDS branded tapes supposedly are guaranteed
to higher standards, and of course cost more. Since the whole DAT thing
never caught on in a big way, DAT branded tapes are rather rare.
-Dave
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