scsi disk

Hello,
I want to add a new disk driver.
Some one can tel me how can i see which /dev/sd?? my scsi disk setting for. i have scsi disks in sda and sdb now.
then the new one must be in sdc or what i get  
fdisk /dev/sdc
unable to open /dev/sdc

But  i get respond for hdc

You will not be able to write the partition table.
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklab
el
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

PLEASE
Help Help
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Aida2Asked:
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ppfoongCommented:

The command "dmesg" should reveal the harddisks detected during bootup, and the assigned device name.

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Aida2Author Commented:
Thank for respo.
I can't see any thing from dmesg after reboot
....
....
 Starting timer : 0 0
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
SCSI device sda: 213196800 512-byte hdwr sectors (109157 MB)
Partition check:
 sda: sda1 sda2 sda3
...
scsi1 : SCSI emulation for USB Mass Storage devices
Starting timer : 0 0
  Vendor: ST316002  Model: 3A                Rev:  0 0
  Type:   Direct-Access                      ANSI SCSI revision: 02
Starting timer : 0 0
Attached scsi disk sdb at scsi1, channel 0, id 0, lun 0
SCSI device sdb: 312581808 512-byte hdwr sectors (160042 MB)
...


HELP

 sdb: sdb4
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ppfoongCommented:

As shown above, you can see sda and sdb. If you can't see sdc, then the 3rd harddisk is not detected. It could be caused by SCSI termination problem, check the jumper on the harddisks.

If you find hda or hdc, then the harddisk is an IDE/ATA harddisk, plugged to the IDE/ATA bus tape instead of SCSI. There should also be relevant info in dmesg for IDE/ATA.





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Aida2Author Commented:
Hello,
There is no jumper in disks. It's hotplug ind scsi disk.
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rindiCommented:
hdc is your CD Drive, most likely. Does your SCSI adapter have a builtin tool which shows you the attached devices? You should be able to enter that tool when booting your system. Adaptec controllers usually are accessed with ctrl+a, check your manual for how to get into that tool.
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Aida2Author Commented:
Thank you it was Ctrl + a  under reboot
is it possible to make a disk removable in adaptec i can see there is a option removable with (), how can i check this (X)

Thanks
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rindiCommented:
This depends on the other hardware, it would have to support hotplugging, if you try that option on hardware which doesn't support hotplugging, you could damage something.
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Aida2Author Commented:
It support hotplugging, But i don't no how can i check the box (X) ok for removable in adaptec configuration.
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rindiCommented:
Sorry, neither do I, as at the moment I don't have a similar configuration around on which I could try that.
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Aida2Author Commented:
Thank you very much
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rindiCommented:
thanks too.
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