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What are Sub Channels

Subchannel includes Data Subchannel and Audio Subchannel, where a disc saves
additional information other than normal data and tracks.

Since not all CD-ROMs/ CD-RWs support subchannel, some game and music vendors save the "fingerprint information" in the two sub channels.
Therefore, if user wishes backup the disc, it is considered as failed if these data do not correctly backup.

The manufacturers that use such measure of CD copy protection include Sony's Securom ("fingerprint " has been saved in Data Subchannel), New Securom ("fingerprint" has been saved in Data and Audio Subchannels), LibCrypt (Sony's PlayStation) and LaserLock. The data saved in Subchannels includes 16bytes (such as Securom and New Securom) and 96bytes (LibCript).

Therefore, the performance of CD-ROM/ CD-RW can read the two Subchannels
include: a. Raw+96, b. Raw+16, c.Raw (the data on Subchannels are unreadable), d. none (both the data on Subchannels and normal bad blocks are unreadable).