[DX] Minidisceistä

["Jarmo Patala" <jarmo.patala@xxxxxxxxxx>]

Minidiskeistä kiinnostuneille suosittelisin seuraavaa nettisiteä:

http://www.minidisc.org/index.php

 

Sieltä löytyy infoa myös palstalla esiintyneisiin kysymyksiin:

1. How many times can I record on a recordable MD?

   Sony claims a blank MD can handle up to 1 million recordings... Time will tell! In practice, the user Table of Contents (user TOC or UTOC) of an MD could become messed up by accident (defective MD recorder or physical damage) and render the MD unusable. The Sony portable MD recorder (MZ-1) allows to recover some unusable MD's in test mode (machine open and test jumper in place) via the TOC erase function: the TOC gets obliterated and that results in a "like-new" blank MD. Physical damage to the TOC cannot be repaired, but similar defects in other parts of the MD should be removed from the available space by creating short quiet tracks that include the problem and recording after labeling these as "bad".

2. How long can the data/audio be stored on a recordable MD?

   Sony claims in their Magneto Optical FAQs that data may be stored with magneto optical technology for more than thirty years without loss or degradation. Once written to the disk, data are safe from the magnetic fields and heat found in normal environments. However, strong magnets placed directly against the MD can destroy data, as evidenced by informal experiments conducted by users. In contrast, a modern (ca. 1999) 'silver' pressed CD from a glass master is reckoned to last around 50 years or so from a chemical point of view. However a problem was found with the chemistry comprising early CD's (of around seven years and older) which caused degradation within a decade.

Itse olen testaillut Sonyn Hi-MD soitinta jossa yhdelle levylle mahtuu jopa 45 tuntia audiota. Näissä uusimmissa laitteissa Hi-MD audiota voi myös siirtää suoraan tietokoneelle,  ei pelkästään tietokoneelta MiniDiskille kuten aiemmissa net-MD laitteissa.

 

73 JP

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