Trailing-Edge - PDP-10 Archives - decuslib10-10 - 43,50524/abstra.rnd
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.ts 50
D2D - Disk To Disk Pack Copy;	24-Jul-81:
D2D (disk to disk) copies an entire disk pack to another disk pack. 
Using Super-USETI and Super-USETO (SUSET.) instead of LOOKUP
and ENTER, as well as performing its own file space allocation and
Storage Allocation Table (SAT) management, results in a fast
copy. At the Univesity of Texas at Austin, copies
of RP06s using FUR which run 4 hours are performed in 40 minutes with D2D.
Unlike "image" copy programs which also use SUSET. but simply
copy block to block and result in a useless BADBLK.SYS, D2D
creates a refreshed pack with a valid BADBLK.SYS.