FC6 Can't see partition?

[Kevin H. Hobbs]

In Fedora Core 6 I can not mount the partition on one of my hard disks.
It was fine in FC5, and I can mount it in the FC5 rescue disk. The
device entries /dev/hdc and /dev/hdc1 exist. It seems like it was
noticed during boot because I see a message in /var/log/messages :

Jan  4 18:21:13 gargon kernel: hdc: 390721968 sectors (200049 MB) w/8192KiB Cache,CHS=24321/255/63, UDMA(100)
Jan  4 18:21:13 gargon kernel: hdc: cache flushes supported
Jan  4 18:21:13 gargon kernel:  hdc: hdc1

When I try to mount it I get :

sudo mount /dev/hdc1 /tmp/hdc1/
mount: /dev/hdc1 is not a valid block device

The hdc1 does not show up in /proc/partitions nor in /dev/disk/by-path/
where hdc shows up as pci-0000:00:0f.1-ide-1:0 -> ../../hdc

The ide controller is :

00:0f.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
        Subsystem: VIA Technologies, Inc. VT82C586/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE
        Flags: bus master, medium devsel, latency 32, IRQ 169
        I/O ports at fc00 [size=16]
        Capabilities: [c0] Power Management version 2

Does anybody know what's going on?
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