>Number:         1238
>Category:       port-i386
>Synopsis:       Reading past end of IDE disk causes EIO, not EOF
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    gnats-admin (GNATS administrator)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 17 20:50:01 1995
>Last-Modified:
>Originator:     Andreas Gustafsson
>Organization:
Araneus Information Systems Oy
>Release:        NetBSD-current as of around June 4, 1995
>Environment:

System: NetBSD xxx.araneus.fi 1.0A NetBSD 1.0A (XXX) #14: Mon Jul 17 10:00:00 EET DST 1995 gson@araneus.pp.fi:/usr/src/sys/arch/i386/compile/XXX i386

>Description:
	Attempting to read past the end of an IDE disk using
	either the raw device or the block device causes an I/O 
	error and an unsightly error message on the console.

	This behaviour is inconsistent with that of the floppy
	and scsi disk drivers (checked on an earlier release),
	both of which simply return an end-of-file when the
	end of the device is reached.  It also needlessly
	complicates the task of making a bit-by-bit disk copy
	using "dd".

>How-To-Repeat:
	On a machine with an IDE disk, say

	  dd if=/dev/rwd0d of=/dev/null bs=512

        and wait patiently until it has read the entire disk.
	Then watch the error messages.

>Fix:
	Unknown.
>Audit-Trail:
>Unformatted: