DAT & MiniDisc

DAT

Holes (Open / Closed):

• 1 : Reserved
• 2 : Tape thickness
  • O : 9 µm
  • C : 13 µm (normal)
• 3 : Track pitch
  • O : 20.41 µm (wide)
  • C : 13.591 µm (normal)
• 4 : Identifies a prerecorded or not
  • O : Prerecorded
  • C : non-prerecorded
• P : Write Protection
  • O : Protected
  • C : Not protected
• A : Physical alignment

Tape Length (with standard re-recording speed of 8.15 mm/s):

• 30 m -> 1 hr
• 60 m -> 2 hr

DDS also has:

• 90 m -> 3 hr

MiniDisc

ATRAC / DSP

• ATRAC (SP) versions: V1, 2, 3, 3.5, 4, 4.5
• ATRAC3 (LP2, LP4)

• DSP Type R: Add 2-pass ATRAC for improved encoding, ATRAC3
• DSP Type S: Includes Type R encoding and improved ATRAC3 decoding

See also here

Devices

• Sony MDS-JB940 QS
  • Type R
• Sony MZ-R501
  • Type R