Memory and Disk
The smallest S/34 had 48K of RAM and an 8.6 MB hard drive. The largest configured S/34 could support 256K of RAM and 256MB of disk space. This cost over US$200,000 back in the early 1980s. S/34 hard drives contained a feature called "the extra cylinder," so that bad spots on the drive were detected and dynamically mapped out to good spots on the extra cylinder... so technically while the system did not recognize more than 256MB, slightly more space than this existed.
Read more about this topic: IBM System/34
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