#1 Burning Software

Hi

Firstly, sorry for all the questions, i just want to make sure I get this right from the start.

In my app the user will need to have a completely blank disk. Naturally I check whether it needs erasing as follows:

bNeedToEraseDisk := m__UCHAR__DiscStatus in [DISC_STATUS_INCOMPLETE, DISC_STATUS_COMPLETE];


However I'm not 100% sure about checking how much disk space will be available _after_ the erase is complete.

I'm using:

if GetDiskSpaceRequiredInBytes>SelectedDevice_DiscSizeInfo.TotalDiscSize then
raise Exception.Create('Not enough space on disk');

(Where SelectedDevice_DiscSizeInfo.TotalDiscSize is set using the PrepareDSI as in your GUI demos).

Is that the best method?

This is not a good idea... Much better one would be to GetTrackInformation( 0xFF ) and check for NWA. For blank track (and blank disc) it should be 0 (zero). Disc status would not be correct for always writable media (DVD+RW, +RW, formatted -RW and BD-RE).

Thanks,

I've changed it to:

bNeedToEraseDisk := TRACK_INFORMATION.m__LONG__NextWritableAddress>0;


Is this the correct code to determine how much free space will be available after erasure?

(TRACK_INFORMATION.m__LONG__NextWritableAddress + TRACK_INFORMATION.m__LONG__FreeLBs) * MODE1_LB_SIZE_IN_UCHARS

Yes, after erase.

Just FreeLBs * BlockSizeInUCHARs.

Hi Anton

I haven't erased yet at the point where I am checking the space, so m__LONG__NextWritableAddress may be > 0. And all the space used by the previously written area should be recoverable (once the erase is done).

I'm not sure what do you mean. Code should look like:

GetTrackInfo(...)

if ( NWA > 0 && IsDiscErasable )
{
EraseDisc();
}

// Do whatever you want here...