Attributes for 150 MB 1/4-inch tape drives (type 150mb)
The following are attributes for 150 MB 1/4-inch tape drives (type 150mb).
- Block size
- The default block size is 512. The only other valid block size is 0 for variable length blocks.
- Device buffers
- The general information for this attribute applies to this tape drive type.
- Extended file marks
- Writing to a 1/4-inch tape can only occur at the beginning of tape (BOT) or after blank tape is detected. If data exists on the tape, you cannot overwrite the data except at BOT. If you wish to add data to a tape that has been written and then rewound, you must space forward until the next file mark is detected, which causes the system to return an error. Only then can you start writing again.
- Retension
- The general information for this attribute applies to this tape drive type.
- Density setting #1 and density setting #2
- The following settings apply:
The default values are 16 for Density Setting #1, and 15 for Density Setting #2.
Setting Meaning 16 QIC-150 15 QIC-120 0 Default (QIC-150), or whatever was the last density setting by a using system.
- Attributes with fixed values
- If a tape drive is configured as a 150 MB 1/4-inch tape drive, attributes for Extended File Marks, Reserve Support, Variable Length Block Size, and Data Compression have predefined values which cannot be changed.