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dection 5Storage Devices.docx

Tape drives can also be rotated for example you can

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Tape drives can also be rotated. For example, you can put a cassette in your tape drive and make a full backup on Saturday night, then remove it and put in a new tape in order to run incremental backups on Sunday night, Monday night, Tuesday night, Wednesday night, Thursday night, and Friday night. When you're done, you have a good archive of tapes, so if you want to keep a historical archive of tapes you could rotate your tapes through this backup process. You could have four different sets of tapes. One set for week one of the month, one set for week two, one set for week three, and one set for week four. This way you keep a one month historical archive of all the data that's been on your system, you can just rotate them through. When you start the first week of the next month, you can write over the information on the first week's tape set and repeat that each week, and you can follow that rotation month after month throughout the year. Another advantage to tape drives is that they can be stored in an archive long term. This means that I can make a backup and keep that backup tape in an archive for years and still retrieve the data off of it. Now, tape drives do have some disadvantages. The key disadvantage is speed. Tape drives are notoriously slow. It takes a long time to read and write information to the tape because tape drives do not use random access. DVDs, hard disk drives, and flash drives use random access, which that you position the heads in the hard disk drive over any sector and retrieve the information you want almost immediately. It only takes a few milliseconds to move the head to the right location and then read information from that location on disk. That's called random access. But tape drives are linear in nature. This means that if there's a file on a tape that you need to restore and that file is located three quarters of the way through the tape, you have to fast forward through the tape until you can reach the right location. Another drawback of tape drives is their durability. Tape drives are mechanical devices. As the magnetic tape inside the cartridge rubs across the top of the read write head over and over it will eventually wear out. Gears and motors also tend to wear out over time. Summary 11:06-11:36 At this point, you might be asking, "Which type of long term storage is best?" My answer is it depends on what you wanna do. If you want quick access to your data and need to store large amounts of data, then you should probably look at a hard disk drive or a solid state drive. If you need information to be portable, so you can move it from one system to another, then you should look at a flash drive,or a rewritable optical drive. If you want to preserve data by backing it up, so you can access it at a later time, then you should consider using a tape drive.
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  • Spring '14
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