TapeDir Example

tddir.gif (10749 bytes)

Tape Directory tab is shown above. The columns displayed are:

Filename: If the tape is written in the ANSI or IBM labeled format, the names of the tape files will be displayed. Otherwise, each file will be shown using the default name "Filexx", where xx will be the sequential number of this particular tape file (e.g. FILE01, FILE02, etc.)

BlkSize: The size of the tape blocks for a given file is indicated in this column. For optimal performance, many records are combined into a block and then written to the tape. The number of records combined is called the blocking factor. For example, if you have a record size of 80 bytes, and a blocking factor of 100, then your block size would be 8,000. As a rule of thumb, tapes used for CD mastering should have 8K or greater block sizes. It is recommended that DVD images use 32K block sizes.

RecSize: In DDP images, the record sizes will typically reflect the sector size for a particular source storage mode. Audio uses 2352 bytes per record, Mode 1 (user data only) uses 2048 bytes. CD-XA is 2336, and any mode that is stored as fully processed data will be 2356 bytes per record.

#Blks: This column reports the number of blocks in a particular file.

#Recs: The number of records in a file is shown in this column.

#Bytes: The actual number of bytes in a file is calculated as #Blks*#Recs. I

Soft Errors: Each block that is read by TapeDir is tested to see if any soft (i.e. correctable) errors occurred. This number is tallied here. Tapes that suffer from many soft errors can also suffer from slow performance which could make them unsuitable for mastering purposes.

Percent Error 

tdperf.gif (19068 bytes)

This is the performance tab.