'\"! tbl |mmdoc
'\"macro stdmacro
.if n .pH g7.id @(#)id	40.4 of 10/10/89
.\" Copyright 1989 AT&T
.nr X
.if \nX=0 .ds x} id 7 "" "\&"
.if \nX=1 .ds x} id 7 ""
.if \nX=2 .ds x} id 7 "" "\&"
.if \nX=3 .ds x} id "" "" "\&"
.TH \*(x}
'\" t
.tr~
.SH NAME
\f4id\f1 \- 3B2 computer Integral Disk Subsystem
.SH DESCRIPTION
The 3B2 computer integral disk subsystem 
may consist of one or two units in two sizes; 30M and 72M.
The files
\f4/dev/dsk/c0d\f2n\f4s0\f1 ... \f4/dev/dsk/c0d\f2n\f4sF\f1
refer to sections of the drive unit number \f2n\f1.  This slicing allows the
media to be broken up into more manageable pieces.
.PP
The
\f4/dev/dsk\f1
files provide
access to the disk via the system's normal
buffering mechanism.
There is also a ``raw'' interface
which provides for direct transfer 
of a specified number of bytes between the disk
and a location in the user's address space.
The names of the raw
disk files are in directory
\f4/dev/rdsk\f1
and are the same as as the corresponding
\f4/dev/dsk\f1
files.
In raw \s-1I/O\s0 the read or write must begin on a word boundary;
transfer counts can be as small as a single byte.
.PP
.SH FILES
\f4/dev/dsk/* 
.br
/dev/rdsk/*\fP
.SH SEE ALSO
Appendix A of the \f2System Administrator's Guide\f1 for tables
showing the default disk partitioning of a variety of manufacturers'
hard disk units.
.Ee
