RAID level 3 is able to correct single-bit errors using only one parity drive. What is the point of RAID level 2? After all, it also can only correct one error and takes more drives to do so. What is...

RAID level 3 is able to correct single-bit errors using only one parity drive. What is the point of RAID level 2? After all, it also can only correct one error and takes more drives to do so. What is the exact data capacity (in bytes) of a mode 2 CD-ROM containing the nowstandard 80-min media? What is the capacity for user data in mode 1?