mtb(7)
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mtb, mtc, mtd Special File
Eclipse MV/family tape subsystem
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DESCRIPTION
A mtb, mtc, or mtd tape subsystem consists of a tape controller
with up to 8 physical units on that controller. The models
supported are as follows:
Class Model # Description
mtb 6026 800/1600 bpi 1/2" reel-to-reel
mtc 6125 1600 bpi 1/2" reel-to-reel streaming
mtc 6231 DC 300/450 cartridge
mtc 6311 DC 300/450 cartridge
mtc E5123SC 1600 bpi 1/2" reel-to-reel streaming
mtd 4307 800/1600/6250 bpi 1/2" reel-to-reel
mtd 6299/6300 1600/6250 bpi 1/2" reel-to-reel streaming
mtd 5308 800/1000/6250 bpi 1/2 " reel-to-reel
While the mtb, mtc, and mtd classes are listed here, the DG/UX
system makes no distinction between the three classes; the three
names may be used interchangably.
A tape unit may be accessed directly via the special file nodes
in /dev/mt and /dev/rmt. These nodes are named in the form:
/dev/[r]mt/c<n>d<m>
where <n> is the hardware device code of the controller and <m>
is the unit on the controller. The nodes in /dev/mt provide
access as a block special device as described in mt(7). The
nodes in /dev/rmt provide access as a character special device as
described in rmt(7).
When accessed as a character special device via the nodes in
/dev/rmt, the maximum physical record size for the model 6231,
6311 and E5123SC tape drives is 8192 bytes. For all other models
listed above, the maximum is 32,768 bytes.
FILES
/dev/mt/*
/dev/rmt/*
DG/UX 4.00 Page 1
Licensed material--property of copyright holder(s)
mtb(7)
SEE ALSO
mt(7), rmt(7)
DG/UX 4.00 Page 2
Licensed material--property of copyright holder(s)