Originally Posted by UnknownVT
Can someone please clarify if that is
7,088x calibrations (which consists of 15-steps) -
or 7,088/15 calibrations?
7,088 viewing/initializations is quite a lot -
allowing for say 6 times a day -
that is still every single day for 1181 days
= about 3 years 3 months.
This is of course dependent on my question above -
is each of the 15-steps counted as one calibration -
or is one cailbration the full 15-steps?
If each step is counted as a calibration then (obviously) all the figures are 1/15th the above -
so every single day for about 79 days or 2 months 18 days
that's still quite a lot for a single DVD-R/-RW to spend in a DVD recorder
(and don't forget we are viewing/initializing it 6 times a day everyday....)
I'm just guessing, but the words suggest 7,088 separate power calibrations, each consisting of 15 tests?
But, as I said above:
"Since a disc left in a unit loads each time the unit is turned on, it probably does the power calibration tests each time. I guess the worst case is you're giving the disc multiple chances to screw up somehow, e.g., hit a tiny bad spot in the PCA area and return an error???"
And, I should add, as a disc ages ("fades"), especially one that is unstable from the manufacturer (Memorex et al?), eventually the law of averages *will* catch up and report that "this disc cannot be recorded"???
From everything I've read, an "unstable" disc (poorly made, aged badly, etc.) is one that might fail the OPC and will become unrecordable from the get-go if it fails the power calibration test.
By the way, I've since read that the OPC is repeated while the disc is recording
...don't remember how often or when. I might try to find that ref. again but not sure how important it is.
Found one ref. to "Active OPC" in a DVD-Recordable.org article discussing a Nero disc check that shows dips at different spots of the graph:
"Some of the graphs have a number of dips in them and this is where the Active OPC (Active Optimized Power Control) kicks in. Active OPC monitors writing power and reflection of the media in use, calculating the optimum laser power and adjusting it in real-time. Which should in theory result in better quality burning."
Not sure if Active OPC is hardware or FW based.
For DVD-R/+R, might be a good idea to power calibrate and get the heck out of dodge...record immediately, finalize and put in good storage somewhere????
P.S. I did a Google search for "DVD OPC" and it returned 1,170,000 entries. I've seen "Immediate OPC," "Walking OPC," and "Running OPC" in just the first two pages of the search results!