November 2007
Intermediate to advanced
736 pages
46h 32m
English
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MAGNETIC ERASING
The erasing of magnetic tape is done in one of three ways. The first, and simplest, method is to place an entire reel of the tape in a strong alternating magnetic field as shown in Fig. 10.3. This leaves the tape in a somewhat unpredictable magnetic state. It is termed bulk erasing and is more useful for removing recorded information from tape.
The second method of erasing tape is to move the tape past a recording head in which there is a high-frequency alternating current, as shown in Fig. 10.4, This is termed ac erasing, and essentially neutralises the tape's magnetic properties.
The third method is to move the tape past a recording head in which there is direct current as shown in Fig. 10.5. This is termed dc erasing, and ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.