Another question on the commands table

[Penokie, George]

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I am working on the letter ballot comments on SBC-3 and the title of one of
the columns is MACT In the Commands for direct-access block device table
(table 31) and I can't figure out what it is supposed to mean.
Does anyone know the what MACT stands for???
Bye for now,
George Penokie
LSI Corporation
3033 41 St NW
Rochester , MN 55901
507-328-9017
george.penokie at lsi.com