Magtek MagneSafe V5, Справочное руководство

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MagneSafe V5
10
Track 1 Decode Status
Bits 7-1 0
Value Reserved Error
This is a one-byte value, which indicates the status of decoding track 1. Bit position zero
indicates if there was an error decoding track 1 if the bit is set to one. If it is zero, then no error
occurred. If a track has data on it that is not noise, and it is not decodable, then a decode error is
indicated. If a decode error is indicated, the corresponding track data length value for the track
that has the error will be set to zero and no valid track data will be supplied.
Track 2 Decode Status
Bits 7-1 0
Value Reserved Error
This is a one-byte value, which indicates the status of decoding track 2. Bit position zero
indicates if there was an error decoding track 2 if this bit is set to one. If it is zero, then no error
occurred. If a track has data on it that is not noise, and it is not decodable, then a decode error is
indicated. If a decode error is indicated, the corresponding track data length value for the track
that has the error will be set to zero and no valid track data will be supplied.
Track 3 Decode Status
Bits 7-1 0
Value Reserved Error
This is a one-byte value, which indicates the status of decoding track 3. Bit position zero
indicates if there was an error decoding track 3 if this bit is set to one. If it is zero, then no error
occurred. If a track has data on it that is not noise, and it is not decodable, then a decode error is
indicated. If a decode error is indicated, the corresponding track data length value for the track
that has the error will be set to zero and no valid track data will be supplied.
Track 1 Encrypted Data Length
This one-byte value indicates the number of bytes in the Track 1 encrypted data field. The field
is always a multiple of 8 bytes in length. This value will be zero if there was no data on the track
or if there was an error decoding the track. Once the encrypted data is decrypted, there may be
fewer bytes of decoded track data than indicated by this field. The number of bytes of decoded
track data is indicated by the Track 1 Absolute Data Length field.
Track 2 Encrypted Data Length
This one-byte value indicates the number of bytes in the Track 2 encrypted data field. The field
is always a multiple of 8 bytes in length. This value will be zero if there was no data on the track
or if there was an error decoding the track. Once the encrypted data is decrypted, there may be
fewer bytes of decoded track data than indicated by this field. The number of bytes of decoded
track data is indicated by the Track 2 Absolute Data Length field.