FBA vs CKD Overview

Parameter Open System IBM z System (Mainframe)
Storage Type FBA (Fixed Block Architecture) CKD (Count Key Data)
Connectivity Fibre Channel/SCSI etc ESCON/FICON
Character sets ASCII EBCDIC
Extent Size 16 MiB, 1GiB 21 cylinders (or) 1113 cylinders
Base Used by many OEMs IBM proprietary

Note: Whether Flash or HDD, it’s still an emulated track for zOS or FB environments

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