How do I know remaining/completed writing cycles?


#1

How do I know, how many writing cycles on a RW disc sector have been completed and how many are still remaining?


#2

For DVDs, you can read the Recording Management Area (-RW) or the Disc Control Blocks (+RW) using the READ DISC STRUCTURE SCSI command (see SCSI or Mt. Fuji). The descriptors keep a running modification count as well as other interesting information, like the model and serial number of the drive that recorded it!


#3

I see. But it needs to be considered, that the inner circles are written onto more frequently.

UDF sparse/sparing tables can keep track and balance the outer/inner edge writing cycles, but once the disc is reformatted, the sparsing tables, which is a part of UDF itself, is lost, as far as I know.

Another approximate way is verifying the burning quality. It should not decrease much for the first 900 cycles, but then, it should plunge.


#4

One of the forum members documented the degradation of DVD-RW after 40 burns:


#5

:black_small_square:Is that degradation also visible on other (especially old) drives? (A Pioneer BD-RW should be reliable)
:black_small_square:What about 150 rewrites?
:black_small_square:How high is the writing speed?
@Vogelschreck


#6

With 4x all the time

I noticed that when I rewrite RWs 5 times a day, I have much less degradation than when writing 5 times over a whole month.


#7

Very interesting.
What if you wait one month and then write 5× per day? Still degrading more?


#8

The first write after one month shows much degradation. Some more writes at the same day only a little.


#9

Is it possible, that the disc degraded itself over the month?