JVC UX-A70MD manual Scms Serial Copy Management System, Hcms High-speed Copy Management System

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SCMS (Serial Copy Management System)

The MD recorder integrated to this unit uses the Serial Copy Management System which allows only first-generation digital copies to be made of premastered software (like CDs or prerecorded MDs).

1st Generation				OK	2nd Generation				NO
	I					GIT
IG T					I		A
D		A			D			L
			L

ABCDEFG

HCMS (High-speed Copy Management System)

Now onto recordable MDs (minidiscs), you can record (copy) sound at a recording speed exceeding the normal speed. This fact requires some restrictions for protecting copyrights.

On this unit, you cannot re-record, at either high speed or normal speed, a song (track) that has been recorded once from a CD at high speed, until 74 minutes elapse after the first recording of the song started.

For example, after having recorded the first song (track) of a CD at high speed, you cannot record it again, at either high speed or normal speed, until 74 minutes elapse after the first recording of that song started.

MD limitations

The MD records data in an original format that differs from that of conventional cassette tapes or DATs. Since there are some limitations with this recording format, the following types of symptoms may occur. These symptoms are not malfunctions.

Symptoms

“DISC FULL” appears, even though there is still enough remaining time on an MD.

“DISC FULL” appears, even though the number of tracks and recording time do not reach the limit.

The JOIN function sometimes does not work.

The remaining time on the MD does not increase even when tracks are erased.

The sound drops out during fast forward or fast reverse.

The amount of recorded time on the MD added to the amount of remaining time is shorter than the MD’s total possible recording time.

Cause

There is a maximum number of tracks which can be recorded, regardless of recording time. More than 254 tracks cannot be recorded on an MD.

•Repeating erasure and recording on the same MD creates many blank portions sparsely on the MD. When record- ing on such an MD, a track is recorded on these blank portions sparsely. If a track is divided and recorded into so many portions, “DISC FULL” appears.

•If a divided portion of less than 8 seconds is made while a track is recorded on the MD, that track cannot be joined to another track using the JOIN function. Further- more, if that track is erased, the remaining time of the MD may not increase exactly by the erased amount.

•If a track has been divided into many portions while being recorded on the MD, sounds will drop out while fast forwarding or reversing such an MD.

You cannot record on a blank portion of less than 2 seconds in the MD. For this reason, the actual recording time of discs may become shorter.

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