Minidisks are simulated in segments. The format of the segment is controled by the CP simulator and is initialized when the segment key is first introduced through the DEFINEDEVICE key. The normal CP read-only, read-write, and multi-write access controls are performed by LINK objects (kor,linkf). A minidisk factory exists to create 3370 minidisk fresh segments and an associated link object

MDISKF(n;PSB,M,SB==>c;OWNER,RLINK,WLINK,SEG)
Where n is the number of 512 byte blocks, PSB,M, and SB are the normal prompt space bank, meter and space bank. If c is zero, OWNER, RLINK, and WLINK are keys to the link object and SEG is a key to the underling fresh segment. The segment has been initialized as a 3370 disk with n FBA-512 blocks.If c is 1 or 2, it isa factory return code and the 4 keys are DK0. If c is 4 there was a failure in initializing the segment and the 4 keys are DK0.