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tape drive Beispielsätze
tape drive
1. The problem was that the tape drive backup wasn’t working and it hadn’t been for some time, even though it appeared to be fine
2. The tape drive could sense its presence when the reel was mounted on the computer ready for use
3. Thursday morning, hurrying across to a tape drive with a new reel of tape, the operator stumbled on a tile in the flooring, and nearly fell
4. Unlike other mass storage devices used in computers, magnetic tape drives do not provide random access to the stored data
5. The magnetic tape drives used in computers work just like audio tape drives; the tape is pulled off of a spool and dragged across a head to read the data, as shown in Figure 27-8
6. Because they are linear access devices, magnetic tape drives are not mounted as volumes in the computer’s file system
7. Magnetic tape drives are used exclusively by backup software programs, which are specifically designed to access them
8. Linear access devices like tape drives also cannot conveniently use a table containing information about the files they contain, as with a hard or floppy disk
9. However, some tape drive technologies, such as digital audio tape (DAT) and digital linear tape (DLT), do create an index on each tape of all the files it contains, which facilitates the rapid restoration of individual files
10. When using a tape drive, the process of writing data to a magnetic tape requires that the tape drive receive a consistent stream of data from the computer
11. Interruptions in the data stream force the tape drive to stop and start repeatedly, which wastes both time and tape capacity
12. Most of the tape drives designed for computer backups include hardware-based compression capabilities that use standard data compression algorithms to store the maximum amount of data on a tape
13. Hardware-based compression is performed by a processor in the tape drive itself and is inherently more efficient
14. To write data to the tape in the most efficient manner, the tape drive must receive the data from the computer in a consistent stream at an appropriate rate of speed
15. The rate at which the data arrives at the tape drive can be affected by many factors, including the interface used to connect the drive to the computer, the speed of the computer’s processor and system bus, or the speed of the hard drive on which the data is stored
16. Even if you have a high-quality tape drive installed in a state-of-the-art server, slow network conditions caused by excessive traffic or faulty hardware can still affect the speed of the data stream reaching the tape drive
17. Tape drives write data to the tape in units called frames or sometimes blocks, which can vary in size depending on the drive technology and the manufacturer
18. When the backup system is functioning properly, the data arrives at the tape drive, fills up the buffer, and then is written to the tape with no delay
19. This enables the tape drive to run continuously, drawing the tape across the heads, writing the buffered data to the tape, and then emptying the buffer for the next incoming frame’s worth of data
20. NOTE The frames used by tape drives do correspond in size or construction with the data link layer protocol frames used in data networking
21. When the data arrives at the tape drive too slowly, the drive has to stop the tape while it waits for the buffer to fill up with data
22. • Install the tape drive in a faster computer
23. • Reduce the processing load on the computer hosting the tape drive
24. Recoverable write errors are most often caused by dirty heads in the tape drive or bad media
25. NOTE Dirty drive heads are the single most common cause of tape drive problems