Talk:Fixed-block architecture

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The content of Storage block was merged into Fixed-block architecture on August 7, 2014. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists. For the discussion at that location, see its talk page.

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]