Disc | Sony MINIDISC specs

MD Components

1. Upper Cartridge

The upper cartridge is made of grey plastics (e.g. polycarbonate). Its purpose is to protect the MD against mechanical damage or dust. The upper cartridge also forms the spine on which the disc ID information will be printed in white ink.

2. Label

The paper label is glued onto the upper cartridge.

3. Disc

The disc is manufactured in the same way as CDs are. It has a polycarbonate layer which contains the data. A thin layer of aluminum is used as reflective media, which is protected by a protective layer against destruction.

4. Clamping Plate

The clamping plate is made of magnetic stainless steel. This steel plate allows to stabilize the MD from the bottom side with a magnetic chuck. Therefore the MD does not require a hole in the upper cartridge and so almost the complete surface of the upper cartridge can be used for the label.

5. Shutter Lock:

It is made of plastics (e.g. POM) and locks the shutter in the close position.

6. Shutter:

The shutter is made of plastics (e.g. POM). It closes the opening in the lower cartridge through which the data is read and it protects the MD against dust and damage.

7. Lower Cartridge:

Also the lower cartridge is made of grey plastics (e.g. Polycarbonate). It contains openings for the disc-drive and the laser that reads out the data. On the backside, information like artist, titles, playing time, etc. as well as the catalogue number is printed directly on the cartridge in white ink.

8. MD Jewel Case:

The MD is packaged in a 3-piece Jewel Case, consisting of clear bottom and lid parts and a grey tray. It contains a booklet and a backline card similar as CD package. The MD Jewel case dimensions are 110 x 91 x 15 mm.

Disc:

Pit

Protective layer

Reflective

layer

Polycarbonate 1.2mm

DADC 11

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