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NetBSD 6.1.5 - man page for drum (netbsd section 4)

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DRUM(4) 			   BSD Kernel Interfaces Manual 			  DRUM(4)

     drum -- paging device

     This file refers to the paging device in use by the system.  This may actually be a subde-
     vice of one of the disk drivers, but in a system with paging interleaved across multiple
     disk drives it provides an indirect driver for the multiple drives.


     The drum special file appeared in 3.0BSD.

     Reads from the drum are not allowed across the interleaving boundaries.  Since these only
     occur every .5Mbytes or so, and since the system never allocates blocks across the boundary,
     this is usually not a problem.

BSD					   June 5, 1993 				      BSD
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