By Susan Wooldridge
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Extra info for Data Processing. Made Simple
Synthetic garnets are at present the most widely used material for MBMs. The bubbles are arranged in a pattern. The presence of a bubble in a pattern indicates a Ύ state; its absence indicates a Ό' state. Bubbles can be moved around in the pattern by applying a weak magnetic field to the main pattern. This is usually done via a permalloy material R f)d +1 ID JLnJLnJL Rotating field CZ±ZJ "=4P Bubble Permalloy pattern Fig. 10. Shifting magnetic bubbles in the pattern. (NiFe) deposited on the film.
There are four major types of transactions: 1. Add a new record. Details are assembled in memory in the output area for writing. 2. Delete an old record. The record is not moved to the output area for writing. 3. Update an existing record with new data; for example, adding to •quantity on hand' because a delivery has been received, subtracting the same amount from 'quantity on order'. 4. Correct an existing record/ for example, altering an address or File Storage Devices 47 correcting a description that was entered incorrectly in a previous processing run.
It is not necessary to read an entirefileto access one record; furthermore, it is possible to read a record into memory, update it, and write it back to the same spot as before. Updating in situ brings about a new problem, however; if the data on the disk were lost in some way, it would not be possible to recreate it by the generation cycling method (Fig. 21). It is necessary instead to make regular copies or 'dumps' of each disk file. Disks can be used for serial processing just as if they were tape files, the only major difference being that there is usually only one file on a reel of tape, but any number of different files on a disk pack, depending on the sizes of the files.