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Date: Tue, 15 Aug 2000 23:54:53 -0400 (EDT)
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Subject: bin/20633: fdisk doesn't handle LBA correctly
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>Number:         20633
>Category:       bin
>Synopsis:       fdisk doesn't handle LBA correctly
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Aug 15 21:00:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Stephen J. Roznowski
>Release:        FreeBSD 4.1-STABLE i386
>Organization:
>Environment:

	

>Description:

I'm not sure if this is related to PR 14974...

When I run fdisk, I get:

	******* Working on device /dev/ad0 *******
	parameters extracted from in-core disklabel are:
	cylinders=3720 heads=255 sectors/track=63 (16065 blks/cyl)

	Figures below won't work with BIOS for partitions not in cyl 1
	parameters to be used for BIOS calculations are:
	cylinders=3720 heads=255 sectors/track=63 (16065 blks/cyl)

	Media sector size is 512
	Warning: BIOS sector numbering starts with sector 1
	Information from DOS bootblock is:
	The data for partition 1 is:
	sysid 12,(DOS or Windows 95 with 32 bit FAT, LBA)
	    start 63, size 8385867 (4094 Meg), flag 0
		beg: cyl 0/ sector 1/ head 1;
		end: cyl 521/ sector 63/ head 254
	The data for partition 2 is:
	sysid 165,(FreeBSD/NetBSD/386BSD)
	    start 8385930, size 34604010 (16896 Meg), flag 80 (active)
		beg: cyl 522/ sector 1/ head 0;
		end: cyl 1022/ sector 63/ head 254
	The data for partition 3 is:
	sysid 12,(DOS or Windows 95 with 32 bit FAT, LBA)
	    start 51375870, size 8385930 (4094 Meg), flag 0
		beg: cyl 1022/ sector 1/ head 0;
		end: cyl 1022/ sector 63/ head 254
	The data for partition 4 is:
	<UNUSED>

Except for partition #1, these values are wrong. They should be

	1:    0/1/1  521/63/254
	2:  522/1/0 2675/63/254
	3: 3198/1/0 3719/63/254

As I understand it, for partition types 0xC, 0xE, 0xF (12, 14, 15)
LBA is used and the C/S/H entries are ignored.

fdisk should be modified to do the correct thing depending on the
partition type.

>How-To-Repeat:

	

>Fix:

	


>Release-Note:
>Audit-Trail:
>Unformatted:


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