The size of the spare area gets set when you issue the format command... and the available sizes come from what's reported in the 'Format Capacities' section of the disc info.
So basically, you query the drive to get a list of sizes and then pick from the list.
Looking at the info posted above, you've got 3 options.
FT: 0x30 - NB: 47305728 (0x02D1D400) - TDP: 49152
FT: 0x30 - NB: 46781440 (0x02C9D400) - TDP: 65536
FT: 0x30 - NB: 48854016 (0x02E97400) - TDP: 768
So your disc is left with 46781440, 47305728 or 48854016 usable sectors. The size of the spare area of course decreases as usable sectors increases.
Your disc is currently formatted with the middle one and would be considered the 'normal' one to go for if you want spare areas.
You can expand the spare area region(s), but that's not something ImgBurn allows for.
The ISA / OSA values in the 'Disc Definition Structure' are to do with spare areas. They correspond to the number of clusters that have been allocated for spare areas in those regions.
8192 clusters = 8192 * 32 sectors = 8192 * 32 * 2048 = 536,870,912 bytes = 512 MiB
Spare areas are per layer. There's an inner area and an outer area, per layer. (Hence ISA and OSA. The user data sectors are in the middle)
I expect there would also be a value available for ISA2, ISA3 etc on your TL/QL discs, but again, that's not covered by the specs I have.
I cannot tell you how much of each has been used, there's only a flag set when it's full. This is already displayed.
Yes, ODD software works at quite a high level really. Larger disc sizes etc shouldn't cause much of an issue, if any issue at all. It's only a problem when the format of a certain structure changes that you'll come unstuck. Luckily, that would mainly cause cosmetic issues.
You issue a 'READ CAPACITY' command to the drive and it returns the size. It's as simple as that.
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