How can I mount a CD Drive in Single User?

Thank you for reading my question.
I need to run single user mode on my iMac because of a disk problem. I would like to be able to mount the cd drive while I am in single user mode. I would also like to be able to mount usb hard drives with confidence, so that I can copy off files from the internal hard drive.
I am in single user mode, which I get to by holding down Command-S on startup. I can look at the disks that are attached to my computer by executing
ls -l /dev/disk*
However this appears to be adding disks. I started with /dev/disk2 and /dev/disk2s1 etc which I understand are partitions on that external drive. Now when I list /dev/disk* I have /dev/disk3 and a couple of partitions on those devs. Is that normal? Have I not unmounted disks properly?
I have been using a directory that already exists as the mount point for my usb drives using
mount -t hfs /dev/disk1 /cores
which worked fine. Alas the disk I mounted on that directory was too small. Now I can't mount a disk on there. Do I need to unmount or fix up that assignment?
If I were to create a directory in /Volumes is that advisable? How do I make the root directory readable is that by using 'mount -uw'?
Thank you. Please if you answer my question, try to be clear on what commands to use and why. Bear in mind that other people will read this, and no one on the web seems able to write suggestions very clearly. Maybe we can be the first! If I have not been clear, please feel free to ask for clarification. i am not a total unix newbie. Rather in the 20 years since I was a sysadmin, my memory has faded.
Pete

I think you need to post this in a different forum. I think the Developer Forums would be the right choice.
In any event from the little Unix I know you can't mount a removable device until it's connected which means you need to put a CD/DVD into the optical drive. At that point if you enter 'df' you should see the device if it is mounted automatically (which I believe it does.)
In single-user mode the entire drive is readable and all files accessible. You are the 'root' user. In order to put the system into write mode you must enter 'mount -uw /'. Note the '/' at the end of the comnmand line. That makes the entire system writeable.
You do not need to create a directory in /Volumes. When the CD/DVD is recognized an entry in /Volumes will appear unless the disc is unformatted.
Now take some of the above with a grain of salt. I'm certainly no Unix expert.

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Mount external Hard drive in Single user mode

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Result:
Permission denied

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Hi JKGN,
Is the directory a located under the root filesystem. ie /a? Are there any other mount point for say USB drive as well? I am not in a position to try it out right now but will get back
to you soon on whether /a exist or not.
Btw, the last thing I managed to do on this system at the time was added a secondary 1TB internal disk with the intention to restore both / and /export/home data onto this disk while
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Vendor: ATA      Product: SAMSUNG HD321KJ Revision: 0-11 Serial No:
Size: 320.07GB <320072932864 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 41 Predictive Failure Analysis: 0
c0t0d0           Soft Errors: 0 Hard Errors: 5 Transport Errors: 0
Vendor: PHILIPS Product: DVD+-RW DVD8801 Revision: AD21 Serial
Size: 17.54GB <17538875392 bytes>
Media Error: 0 Device Not Ready: 5 No Device: 0 Recoverable: 0
Illegal Request: 10 Predictive Failure Analysis: 0
c2t0d0           Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: JetFlash Product: Transcend 16GB   Revision: 1100 Serial No:
Size: 0.00GB <0 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 7 Predictive Failure Analysis: 0
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        Logical Node: /dev/rdsk/c0t0d0s2
        Physical Node: /pci@0,0/pci-ide@1f,1/ide@0/sd@0,0
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As a result, I am left with no option but the need to rebuild this system with only a single primary disk while in single user mode. However, the single user mode that I am in is the
one from Solaris installation disk with restrictive (_cannot create folder for mount point or running disk management utilities_) capability such as those services just covered, compared to one from a completed Solaris installation system with full access to all filesystems and utilities / commands in general.
I would very much value your assistance on how to mount both CD & USB in this restrictive limited Read Only OS (assume that it is running from memory) in order to get complete access to
the blank primary disk so that full restore with ufsrestore could take place.
Thanks in advance,
Jack
Edited by: 797805 on 9/06/2012 04:15

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Identifier:      com.apple.iPhoto
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Build Info:      iPhotoProject-4240000~8
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