c/fdisk report partition overlaps!?
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pseelig@archimedes.zdv.Uni-Mainz.DE X-Server-Date: 14 Mar 1998
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I installed a new Western Digital EIDE hard disk (WD22500L) on
a GigaByte GA586HX mother board addressing it in the BIOS in NORMAL
mode. It doesn't matter whether i use "fdisk" or "cfdisk" for
partitioning, i always get reported overlapping partitions by
"fdisk". Verifying the partitioning using "fdisk" i get the following
rather disturbing output:
--------------------snip-------------------------
[root]/root > fdisk
Using /dev/hda as default device!
The number of cylinders for this disk is set to 4960.
This is larger than 1024, and may cause problems with:
1) software that runs at boot time (e.g., LILO)
2) booting and partitioning software form other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): p
Disk /dev/hda: 16 heads, 63 sectors, 4960 cylinders
Units = cylinders of 1008 * 512 bytes
Device Boot Begin Start End Blocks Id System
/dev/hda1 * 1 1 102 51376+ 83 Linux native
/dev/hda2 103 103 712 307440 6 DOS 16-bit >=32M
/dev/hda3 713 713 3714 1513008 5 Extended
/dev/hda5 713 713 814 51376+ 83 Linux native
/dev/hda6 815 815 916 51376+ 83 Linux native
/dev/hda7 917 917 1174 130000+ 82 Linux swap
/dev/hda8 1024 1175 1479 153688+ 83 Linux native
/dev/hda9 1024 1480 2190 358312+ 83 Linux native
/dev/hda10 2048 2191 2698 256000+ 83 Linux native
/dev/hda11 2048 2699 3308 307408+ 83 Linux native
/dev/hda12 3072 3309 3714 204592+ 83 Linux native
Command (m for help): v
Warning: partition 7 overlaps partition 8.
Warning: partition 7 overlaps partition 9.
Warning: partition 8 overlaps partition 9.
Warning: partition 9 overlaps partition 10.
Warning: partition 9 overlaps partition 11.
Warning: partition 10 overlaps partition 11.
Warning: partition 11 overlaps partition 12.
1550542 unallocated sectors
--------------------snip-------------------------
The claim of partition overlaps seems to be rather false regarding the
correct starting and ending points of the partitions!?
Verifying the partition table with "cfdisk" i get the following output
(table view):
--------------------snip-------------------------
Partition Table for /dev/hda
---Starting--- ----Ending---- Start Number of
# Flags Head Sect Cyl ID Head Sect Cyl Sector Sectors
-- ----- ---- ---- ---- ---- ---- ---- ---- -------- ---------
1 0x80 1 1 0 0x83 15 63 101 63 102753
2 0x00 0 1 102 0x06 15 63 711 102816 614880
3 0x00 0 1 712 0x05 15 63 1023 717696 3026016
4 0x00 0 0 0 0x00 0 0 0 0 0
5 0x00 1 1 712 0x83 15 63 813 63 102753
6 0x00 1 1 814 0x83 15 63 915 63 102753
7 0x00 1 1 916 0x82 15 63 1023 63 260001
8 0x00 15 63 1023 0x83 15 63 1023 63 307377
9 0x00 15 63 1023 0x83 15 63 1023 63 716625
10 0x00 15 63 1023 0x83 15 63 1023 63 512001
11 0x00 15 63 1023 0x83 15 63 1023 63 614817
12 0x00 15 63 1023 0x83 15 63 1023 63 409185
--------------------snip-------------------------
This claims that the starting and ending points from partition 9
through 12 are all located on the identical cylinder 1023!?
For sake of completeness here is cfdisk's sector view:
--------------------snip-------------------------
Partition Table for /dev/hda
First Last
# Type Sector Sector Offset Length Filesystem Type (ID) Flags
-- ------- -------- --------- ------ --------- ---------------------- ---------
1 Primary 0 102815 63 102816 Linux (83) Boot (80)
2 Primary 102816 717695 0 614880 DOS FAT16 (big) (06) None (00)
3 Primary 717696 3743711 0 3026016 Extended (05) None (00)
5 Logical 717696 820511 63 102816 Linux (83) None (00)
6 Logical 820512 923327 63 102816 Linux (83) None (00)
7 Logical 923328 1183391 63 260064 Linux Swap (82) None (00)
8 Logical 1183392 1490831 63 307440 Linux (83) None (00)
9 Logical 1490832 2207519 63 716688 Linux (83) None (00)
10 Logical 2207520 2719583 63 512064 Linux (83) None (00)
11 Logical 2719584 3334463 63 614880 Linux (83) None (00)
12 Logical 3334464 3743711 63 409248 Linux (83) None (00)
Pri/Log 3743712 4999679 0 1255968 Free Space None (00)
--------------------snip-------------------------
I formatted and installed anyway, and obviously everything seems to be
running fine since two days. But i don't feel really comfortable with
these fdisk warnings.
Do i really have to worry about this or can i savely assume that both
fdisk programs are somewhat only becoming confused by the large disks
size? Can i safely ignore these warnings? Did i overlook something
when i partitioned the drive? What should i take into account for
properly partitioning to make these warnings disappear?
Thank you, P. *8^)
--
Paul Seelig pseelig@goofy.zdv.uni-mainz.de
African Music Archive - Institute for Ethnology and Africa Studies
Johannes Gutenberg-University - Forum 6 - 55099 Mainz/Germany
My Homepage in the WWW at the URL http://www.uni-mainz.de/~pseelig
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