This patent focused on mercury delay lines, but it also discussed delay lines made of rotating disks to transfer data to a read head at one point on the circumference from a write head elsewhere around the circumference.
22.
The problem is that, with a long string of zeros, there's no way for the disk drive's controller to know the exact position of the read head, and thus no way to know exactly how many zeros there are.
23.
This sensor works in a similar fashion to the magnetic read head found in a magstripe card reader, except that it senses not a change in magnetic flux, but a change in the dielectric constant of the card's material.
24.
Most early computers were not fast enough to read a sector, move the data from the buffer to somewhere else, and be ready to read the next sector by the time that next sector was appearing under the read head.
25.
:: The big advances have been magnetoresistance-based read heads, especially GMR, and media based on paramagnetic coupling to overcome the superparamagnetic _ effect at small bit sizes . . . I think the latter technology was codenamed " pixie dust ".
26.
As the motor's speed decreases from 1, 800 to 600 rpm when the read head moves away from the center ( which is the start of the recording ), the disc constantly moves past the read head at a constant speed.
27.
As the motor's speed decreases from 1, 800 to 600 rpm when the read head moves away from the center ( which is the start of the recording ), the disc constantly moves past the read head at a constant speed.
28.
Whereas a HD read head would only pick up the half track that drive had written, the wider DD read head would pick up the half-track written by the HD drive mixed with the unerased half-track remnant of the track written earlier by a DD drive.
29.
Whereas a HD read head would only pick up the half track that drive had written, the wider DD read head would pick up the half-track written by the HD drive mixed with the unerased half-track remnant of the track written earlier by a DD drive.
30.
To access memory on the tape, a Turing machine moves a " read head " along it in finitely many steps : the tape is therefore only " potentially " infinite, since while there is always the ability to take another step, infinity itself is never actually reached.
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