Control Program Facility: Difference between revisions

Revision as of 15:04, 1 June 2019

Revision as of 13:10, 9 May 2020

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==Data storage==

In most computers prior to the System/38, and most modern ones, data stored on disk was stored in separate logical [[Computer file|files]]. When data was added to a file it was written in the sector dedicated to this, or if the sector was full, on a new sector somewhere else.

The System/38 adopted the [[single-level store]] architecture, where main storage and disk storage are organized as one, from the abandoned [[IBM Future Systems project]] (FS).<ref>{{cite web|url=https://people.cs.clemson.edu/~mark/fs.html|title=IBM Future System (FS) - 1970s|author=Mark Smotherman|accessdate=October 11, 2017}}</ref> Every piece of data was stored separately and could be put anywhere on the system. There was no such thing as a physically contiguous file on disk, and the operating system managed the storage and recall of all data elements.