Tape format/density identification 1

[Avardan]

Could anyone point me to a website that shows hole patterns on tapes?

I know that there is a pattern for holes that determine this information... (i.e. on the back of an 8mm tape, there is a pattern of 4 holes at the corners on the underside of the tape.)

Anyone out there know what I'm talking about?

--Cheers!

 

[Avardan]

ok...in reply to my own post...this is for 4mm drives. While not answering the question, at least it addresses the underlying issue.

The following diagram is a rough sketch of the bottom side of
the DAT cartridge.

+------ Recognition Hole 1
| +---- Recognition Hole 2 +--- File Protect Hole
| | +-- Recognition Hole 3 | +- Recog.H. 4
| | | | |
+---------------------------------------------+
| o o o o O o o |
+---------------------------------------------+
| + + |
| |
+---------------------------------------------+
| |
| / \ / \ |
| | | | | |
| \ / \ / |
| |
| || || |
| || || |
| || || |
+---------------------------------------------+

The depths of the four recognition holes encode the
type of cartridge.

Hole # Tape
1 2 3 4 Thickness Length Coating Format
------------------------------------------------------
0 0 0 0 13 um 60m MP DDS, Audio
0 0 1 0 Head Cleaning Cartridge
0 1 0 0 9 um 90m MP DDS
1 0 0 0 6.9 um 120m MP+ DDS-2
1 0 1 0 6.9 um 125m MP++ DDS-3
1 1 0 0 4.5 um 150m ME DDS-4

0: shallow, 1: deep