Information Technology Reference
In-Depth Information
Multimedia Commands
Each of the commands below is documented in the Multimedia Commands
(MMC) specification.
READ FORMAT CAPACITIES
The READ FORMAT CAPACITIES command requests a structure con-
taining one or more descriptors that specify a number of blocks and a block
length that the media can be formatted for. The device returns the structure
in the data-transport phase. If the media is currently formatted, the first
descriptor in the structure contains the values in use. If the media is unfor-
matted, the first descriptor in the structure contains the values that will
result in the maximum storage capacity. One or more alternate descriptors
with different values can follow. This command is optional for SBC devices.
READ TOC/PMA/ATIP
Devices with CD or DVD media use the READ TOC/PMA/ATIP com-
mand to provide data from a table of contents (TOC), data from the pro-
gram memory area (PMA), and absolute time in Pre-Grove (ATIP) data.
The format of the response varies with the response type. The ATIP data
contains information required by CD burners. The ATIP format is defined
in “orange books” that Philips Electronics provides to companies with
whom Philips has a CD-information or license agreement. SBC devices
aren't likely to need this command and aren't required to support it.
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