Talk:Fixed-block architecture

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CKD versus CHR/CTR

The article mistakes terminology:

IBM mainframe systems' disk layout had traditionally been count-key-data (CKD)…

In fact, the physical layout of the first FBA devices remained precisely the same; it was in the disc controllers that the differences occurred.

CKD had implications for the channel programmer, in that it was possible for a record to be located not solely by its location, but by a key. However, the actual architecture was CHR (cylinder-head-record), also called CTR (cyl-trk-rec). See DASD article.

--UnicornTapestry (talk) 01:06, 7 January 2009 (UTC)[reply]