Weird partition error messages

[Ben Paul Wise <bwise sito saic com>]

Folks, 

I recently upgraded from RHL 6.2 to 7.0, and I'm getting a weird message 
about partitions.

I completely re-installed RHL, expecting it to respect the existing Windows 
partitions. They were the usual C: and D: drives. Everything appeared to work 
fine, and I've been running for a few days w/o problem under either OS.

I want to automount the two Windows partitions. Therefore, I tried to list 
partitions with fdisk, cfdisk, and sfdisk. They give the messages below:

----------------------------

as either regular user or root, 'fdisk -l' produces neither output nor errors.

----------------------------

as regular user, cfdisk produces:

  FATAL ERROR: Cannot open disk drive
     Press any key to exit cfdisk


as root, cfdisk produces:

FATAL ERROR: Bad logical partition 6: enlarged logical partitions overlap
                     Press any key to exit cfdisk

----------------------------
sfdisk -l produces this:

Disk /dev/sda: 2213 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls   #blocks   Id  System
/dev/sda1   *      0+    254     255-  2048287    6  FAT16
/dev/sda2        255     257       3     24097+  83  Linux
/dev/sda3          0       -       0         0    0  Empty
/dev/sda4        463    2212    1750  14056875    5  Extended
/dev/sda5        479+    606     128-  1028159+   6  FAT16
/dev/sda6        607+   2212    1606- 12900163+  83  Linux
/dev/sda7        463+    471       9-    72229+  82  Linux swap

Disk /dev/sdb: 1021 cylinders, 64 heads, 32 sectors/track
Units = cylinders of 1048576 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls   #blocks   Id  System
/dev/sdb1          0       -       0         0    0  Empty
/dev/sdb2          0       -       0         0    0  Empty
/dev/sdb3          0       -       0         0    0  Empty
/dev/sdb4   *      0+   1020    1021-  1045488    6  FAT16

----------------------------

Can anyone give me some pointers on what went wrong, how to diagnose it in 
more detail, and (of course!) how to fix it?

Thanks in advance!

-- 
Ben Wise, PhD            Mobile: 703-731-5144
SAIC                     GnuPG ID: 0xF491BD21
http://www.saic.com       bwise sito saic com