Read CD-ROM Capacity

2.22Read CD (BEh)

IMPORTANT: This command applies only to models DRM-602X, DRM-624X, DR-U124X,

DR-UA124X

Operation code is (BEh).

The Expected Sector Type field is used to limit the amount of information returned to the Host. If the Requested Sector(s) do not match the specified type , the command will be terminated with a Check Condition. The Sector that does not match will not be transferred to the Host. The sense key shall be set to ILLEGAL MODE TOR THIS TRACK.

The Synch Field Bit, when set to one indicates that the Synch Field from the sector will be included in the data stream. Note that the data fields that are requested to be included in the data stream shall be contiguous. The Synch Field information (if selected) will be the first information in the data stream; all other fields will follow.

The Header(s) Code is an encoded field that indicates the Header / Sub-header information to be placed in the data stream.

The User Data Flag, when set to one, indicates that the Data part of a CD Sector shall be returned in the data stream. When set to 1, the whole user data will be returned to the host. Note that the setting of the Mode Select Density Code does not apply to this command, and the physical user data will be returned . If the current track is an Audio Track then the Audio Data will be returned, else the normal CD-ROM data will be returned. The possible data lengths are 2048,2336,2328 and 2352.

The EDC and ECC Flag, when set to one, indicates that the EDC and ECC (L-EC) field shall be included in the data stream. For Mode 1 CDs this will include the 8 bytes of pad data.

Error Flag(s) is an encoded field that indicates which (if any) of the C2 and / or Block Error data will be included in the data stream. All the field types are mandatory. If the drive does not support the C2 pointers (as reported in the Mode sense Capabilities page) the data returned shall be zero filled.

The Sub-Channel Data Selection bits indicate which CD Sub-Channel information is to be included in the data stream., the “}Raw”} Sub-Channel information (All eight channels , on byte from each of the small frames.) If the bit is set , then that Sub-channel data will be included in the data stream to the Host.

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