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R8 Series Drive Command Reference Manual  
Version 0.90
 
Page  37 
 
4.16 READ BUFFER CAPACITY Command  
The Block bit is supported. 
When a CD medium is inserted in the drive, or no medium is inserted in the drive, the Length of Buffer field in the READ BUFFER 
CAPACITY data is set to 131800h. When a DVD medium is inserted in the drive, the Length of Buffer field in the READ BUFFER 
CAPACITY data is set to 188000h. 
If a WRITE command whose Transfer Length exceeds the Blank Length of Buffer value divided by 800h (or Available Buffer value), 
the drive terminates the WRITE command with the Check Condition status, and  set  the SK/ASC/ASCQ values to NOT 
READY/LONG WRITE IN PROGRESS (2/04/08) 
4.17 READ CAPACITY Command  
The RelAdr bit is not supported and must set to 0.   
If empty disc is mounted, the Logical Block Address field in the Read Capacity Data is set to zero. 
If a non-blank +RW disc is mounted, the Logical Block Address field in the Read Capacity Data is set to 23053Fh. 
If a disc which is not a +RW and has no Complete Session is mounted, Logical Block Address field in the Read Capacity Data is set to 
zero. 
When a CD-R/RW disc is mounted, if it is recorded by Track-at-once, the Logical Block Address field in the Read Capacity Data is 
set to the LBA immediately behind of the outermost Lead-out, so 2 Run-out blocks will be encountered. 
4.18 READ DISC INFORMATION Command 
For +R media, the Last Session Lead-in Start Address is the LBA of where the next Intro shall be recoded. If no session exists on the 
disc, then the value returned is  00000000h. If the disc has complete status, then the value returned is FFFFFFFFh. 
For +R media, the Last Possible Lead-out Start Address is the LBA found in the ADIP of the disc’s lead-in. If the disc has complete 
status, then the value returned is FFFFFFFFh. 
The OPC table is not supported for  +R/+RW media. 
4.19 READ DVD STRUCTURE Command 
Following Format codes are supported. 
Table 28 - Format Code for READ DVD STRUCTURE command 
Format 
Code 
Returned Data 
Description 
00h 
Physical 
Returns information in the DVD Lead-in area 
01h 
Copyright  
Returns the Copyright information from DVD Lead-in 
02h 
Disc Key 
Returns the Disc Key obfuscated by using a Bus Key on the DVD -ROM media 
03h 
BCA 
Returns the BCA/NBCA information on DVD media 
04h 
Manufacturer’s 
Returns the Disc Manufacturing information from DVD Lead-in 
05h 
CGMS, CPM  
Returns CGMS, CPM information from specified sector 
06h 
Media Identifier 
Returns Media Identifier protected by using Bus Key  
07h 
Media Key Block 
Returns M edia Key Block protected by using Bus Key 
0Ch 
RMD in last Border-out  
Returns the Field of RMD in last Border-out of the DVD-R/-RW disc 
0Dh 
RMD 
Returns RMD sectors which recorded in RMA of the DVD-R/-RW disc 
0Eh 
Pre-recorded information 
Returns Pre-recorded information in Lead-in of the DVD -R/-RW disc 
0Fh 
Unique Disc Identifier 
Returns Unique Disc Identifier of the DVD-R/-RW disc 
10h 
Physical in the Lead-in 
Returns Physical format information of Control Data zone in the Lead-in 
20h 
Layer boundary 
information 
Returns DVD+R Double Layer Recording information 
30h 
Disc Control Blocks 
Returns the Disc Control Block identified by the Content Descriptor 
C0h 
Write Protection 
Return the Write Protection Status 
FFh 
Structure List 
Returns a list of DVD structure present in the specified Layer