Using $20080820; 10: Evolution
We've been using the following code as a fast ReadCooked and it works 99% of the time
BUT in a rare but repeatable set of conditions a complete system hang (Task Manager doesnot help) will occur
1) read is to an area outside a track (with a specific disk) the function returns false normally but 1 sector will return success
2) after that the next read to a track area will put the sector count into the buffer and then pad 1 sector with 0 (other data in buffer is uneffected) - this will happen with a cooked read as well
3) do a number of other additional reads successfully
4) Reread previously read sector (with cooked) will HARD crash a PC
5) Log finishes with
DeviceIoControl() failed, status 121 ( 0x79 )
Semaphore timeout, re-executing the CDB, 1 vs. 5000
Linden
AnEXCEPTION := StarBurn_CdvdBurnerGrabber_ReadRaw(
_CdvdBurnerGrabber,
@ExceptionText,
sizeof(ExceptionText),
Status,
@aCDB_FAILURE_INFORMATION,
EXPECTED_LB_TYPE_ANY,
_Block,
_BlockCount, // 1 - 32
ERROR_FIELD_NO_ERROR, // No error data included
FALSE, // No EDC/ECC data
TRUE, // we need user data
HEADER_CODE_NONE, // No headers
FALSE, // No SYNC pattern
SUBCHANNEL_NO, // No sub-channel
_Buffer, // Pointer to data buffer to receive the payload
_BufferLen );
called with
if abs( SlowCooked - LBA ) > 1000 then
begin
SlowCooked := -1000; //try again
ttick := gettickcount;
Result := TStarBurnRAWClasses.SB_CdvdBurnerGrabber_ReadCooked( CdvdBurnerGrabber, LBA, blocks, buf, blocks * FSectorSize, FALSE );
if gettickcount - ttick > 3000 * blocks then
SlowCooked := LBA + blocks div 2;
end;
if not result then
//need the exception for bad LBA processing
Result := TStarBurnRAWClasses.SB_CdvdBurnerGrabber_ReadRaw( CdvdBurnerGrabber, LBA, blocks, buf, blocks * FSectorSize );
_________________
Linden
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