source: t29-www/en/devices/univac9400/discdrives.shtm @ 156

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  • Synced translation of Univac 9400 Disc Drives page

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26
27<div class="box center auto-bildbreite">
28    <img src="/shared/photos/rechnertechnik/univac/plattenlaufwerke.jpg" alt="Die Plattenlaufwerke" width="595" height="446" />
29    <div class="bildtext">
30    <p>
31        Disc drives have a much smaller access time compared to
32        tape drives. On the other side, the controlling of the drive
33        and the 10 heads is very complex, so they needed a whole
34        cabinet with electronics (in the photo only particulary mapped).
35        <br />The storage capacity of the original 8414 series
36                is 7.5MB per disc pack. Our drives (1970s, 8425 series) can
37                already store 50MB. For that time, this was an incredible size.
38                <br />We have currently connected three drives, as you can see
39                in the picture.
40    </p>
41    </div>
42</div>
43
44<div class="box center auto-bildbreite">
45        <img src="/shared/photos/rechnertechnik/univac/diskkoepfe.jpg" alt="Disc heads" width="595" height="511" />
46    <div class="bildtext">
47           <p>The disc heads are amazingly big. The moving coil (on the left hand)
48              plunges into an heavy pot magnet (not visible in the picture) and
49                  thus moves the complete slide on it's position.
50                  <br/>Therefore it works just as an ordinary loudspeaker, but the moving
51                  masses are much higher. The predecessor still moved the sled pneumatically.
52                  <br/>There is a bottle of wine in the right hand of the picture for
53                  comparison.
54                </p>
55        </div>
56</div>
57
58
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