US 5,668,787 A · Mark length recording system with trial writing to maximize recording power and error recovery

Abstract

An optical disk recording, and reproducing apparatus for recording and reproducing information and which is capable of storing a large amount of information, transferring data at a high speed, and supporting SCSI-1 and SCSI-2. The magnetooptical-disk recording and reproducing apparatus is of the same size as that of the 5.25-inch magnetic disk recording and reproducing apparatus. The front panel 1 has the cartridge slot 2 and cartridge ejection button 3 provided thereon so that a cartridge including a disk for recording and reproducing information is inserted in or ejected from the apparatus. The cartridge insertion slot 2 has a double flap provided so that at least one part of the double flap closes the slot, preventing dust from entering through the cartridge slot 2 except when the cartridge is inserted in or ejected from the apparatus. The magnetooptical-disk recording and reproducing apparatus can record information of 1 GB/side or above on the disk.

Claims5

Dependent claims

A disk recording and reproducing apparatus comprising:

a disk having a format in which a recording area is divided into a plurality of zones in a radius direction so that a recording density of each zone is substantially constant independent of said radius direction;
and
means for producing a recording mark, the recording mark producing means including:
a double Phase Locked Loop for independently discriminating data applied to a front edge and a tail edge,
a trail writing control which controls a setting of recording power in accordance with previously written data in at least one region of said disk,
a modulation circuit which converts information to be recorded into a Run Length Limiting code, and
a direct edge detector which adjusts a gain of a reproduced signal from said disk automatically by equalizing said reproduced signal without differentiating.

4 more elements

Dependencies are inferred from the claim text.

Mark length recording system with trial writing to maximize recording power and error recovery

Life of this patent

Mark length recording system with trial writing to maximize recording power and error recovery

Life of this patent

Abstract

Claims5