Recovery Procedures to Copy Single-File Recorded Magnetic Tapes Containing Unreadable Data
Original Publication Date: 1988-Apr-01
Included in the Prior Art Database: 2005-Feb-15
After data is recorded as a single file on a magnetic tape, a defect can arise in the middle (or beginning) of the tape. This defect makes the data beyond the defect unreadable using normal read commands. To circumvent this problem, the tape is moved forward past the defect without reading the tape to a sector having a number higher than that expected for the desired data. After the tape has been positioned to this incorrect sector, the current block count field recorded on the media is read to determine at what block the tape is positioned. Then the tape will be moved in the appropriate direction (forward or backward) to a desired block. If the read fails, the process is repeated for the next desired data until the read is successful. Then the remainder of the data on the tape is read in the usual manner.