Mounting External Disks[freeagent]

Hi everyone.
I have the following setup.
--> 5 Macpros with 1 external disk[freeagent] each
--> 5 users share Files using LAN
--> In each Macpros, there are 2 users, 1 admin and 1 standard user
I noticed that when an Admin user is logged, all disks mounted which includes the external disks, are seen in the network but when a Standard user is logged on, the disks mounted are not seen.
How do I fix this? I am not familiar on how to setup the permissions/rights for this.. Using windows I can fix this.
I don't want the users to log in as Admin. They should be using the standard account and be able to share whatever disks they have mounted and be seen in the local network.
Your inputs are appreciated.
Thanks all!

Hi, the easiest wayt o set up External, or any Shares, Groups, Users, Privilges is to get Get Sharepoints...
http://www.hornware.com/sharepoints/

Similar Messages

Yosemite cannot mount external disks

Since I upgraded to Yosemite my IMAC does not mount external disks, even the bright new one I bought
I have also a Macbook Air that I upgraded to Yosemite and these same external disks can be mounted on the Macbook Air.
I have searched on the Apple support community and on the internet and quite some people whom upgraded to Yosemite have the same problem.
I checked the USB specs on both the IMAC and the MACbook Air
IMAC :
     Hostcontroller : builtin userinterface
     OS hostcontroller : AppleUSBEHCI
     PCI- code : 0x3b34
     PCI revision code : 0x0006
     PCI factory code : 0x8086
     Busnb : 0Xfd
MACBook Air:
     Hostcontroller : builtin userinterface
     OS hostcontroller : AppleUSBEHCI
     PCI- code : 0x0d9d
     PCI revision code: 0x00a2
     PCI factory code : 0x10de
     Bus Nb : 0x24
Needless to say that I need the data stored on the external disks.
Thks for helping me out.

I have read that if you turn Spotlight off you will have no problems. Open Spotlight, choose "privacy", click the "+" at the lower left and add what you do not Spotlight to search. Worked for me. I have 2 internal Seagates formatted OS X journaled in an external case.

Upgraded to 10.4.9 on MBP 15", now, I can't mount external hard disk!

Hi all,
I have a LaCie 500GB drive that I've been using perfectly since I've gotten it, but alas, I upgraded to 10.4.9 and it no longer mounts either by it's USB interface or by its Firewire interface.
My machine is a MBP 15" (2.16 GHz, 2 GB Ram), which works perfectly in all other respects and is now running 10.4.9.
The symptoms are that when I plug it in, I usually get the message, "The disk you inserted was not readable by this computer" with the options "Initialize...", "Ignore", and "Eject". So far, I haven't pressed any buttons except Ignore or Eject. Sometimes, I do not get this message, but it still doesn't mount, it just silently does nothing.
So, after pressing "Ignore", I've opened Disk Utility and had a look. The physical drive appears and there is one volume named "disk2s6" which for all purposes is probably my normal, logical volume (partition). However, last time it mounted on this machine, it was named "Archive". This logical volume is grey and will not mount no matter how many times I press the "Mount" button. It just does nothing.
OK, so, while I'm in Disk Utility, I ran Verify Disk and, after the normal routine, it comes back with "No Repairs Necessary". I've also tried "Repair Disk" and this comes back "No repairs were necessary", again after the full, normal processing of the various things.
I also performed a Fix Permissions on my startup-volume, but this didn't help either.
Next test was to mount the disk on my MacMini (PPC) instead, also running 10.4.9. It mounts perfectly and it properly comes up with the name "Archive" as expected.
I've then tried to mount other devices on my MBP including a USB memory key, and another external Firewire drive. These both mount perfectly on my MBP.
While I was at this, I've also tried new USB and Firewire cables, this didn't affect my results in the least.
I've finally verified that there is nothing in /Volumes out of the ordinary that might prevent it from mounting by doing a "sudo ls -la" whilst in /Volumes/. There's not a thing that would affect the mount-point.
I then disabled my folder actions that I've been running on the directory /Volumes *I had an action used to backup my USB key). Unfortunately, I still have the same issue.
Finally, I downloaded the Combo 10.4.9 installer, booted into Safe Mode (to trigger an automatic fsck), then rebooted and installed the 10.4.9 Combo installer, in case there was some weirdness in the Software Update upgrade to 10.4.9.
What stone have I left unturned? Why won't this drive mount, but it works perfectly elsewhere? I want to get back to using Aperture on my MBP and my entire photo Library is on this disk (well, and backed up on another external drive, but it lives normally on my MBP).
MBP 15" 2.16GHz + LaCie 500GB Ext Firewire drive Mac OS X (10.4)
Mac OS X (10.4)

Here's some additional info...
When executing a manual mount: I get this:
sudo mount -v /dev/disk1s6 /Volumes/Archive
/dev/disk1s6 on /Volumes/Archive: Incorrect super block.
During a normal plug-in-the-disk-and-expect-it-to-mount-automatically, this is what diskarbitrationd reports:
22:45:40 iokit [0] -> diskarbitrationd [41]
22:45:40 created disk, id = /dev/disk1.
22:45:40 created disk, id = /dev/disk1s3.
22:45:40 created disk, id = /dev/disk1s4.
22:45:40 created disk, id = /dev/disk1s6.
22:45:40 created disk, id = /dev/disk1s2.
22:45:40 created disk, id = /dev/disk1s1.
22:45:40
22:45:40 diskarbitrationd [41] -> diskarbitrationd [41]
22:45:40 probed disk, id = /dev/disk1s6, with hfs, ongoing.
22:45:40
22:45:40 diskarbitrationd [41] -> SystemUIServer [289]:13363
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s1.
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s2.
22:45:40 dispatched callback queue.
22:45:40
22:45:40 SystemUIServer [289]:13363 -> diskarbitrationd [41]
22:45:40 dispatched response, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s1.
22:45:40 dispatched response, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s2.
22:45:40
22:45:40 diskarbitrationd [41] -> diskarbitrationd [41]
22:45:40 probed disk, id = /dev/disk1s6, with hfs, failure.
22:45:40 probed disk, id = /dev/disk1s6, no match.
22:45:40
22:45:40 diskarbitrationd [41] -> SystemUIServer [289]:13363
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s6.
22:45:40 dispatched callback queue.
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s4.
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s3.
22:45:40 dispatched callback, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1.
22:45:40
22:45:40 SystemUIServer [289]:13363 -> diskarbitrationd [41]
22:45:40 dispatched response, id = 914042DE:00000000, kind = disk peek, disk = /dev/disk1s6.
22:45:40
Mac OS X (10.4)
Mac OS X (10.4)

Fire wire external disk fails to mount

Hello,
I've been trying to work out how to access my LaCie external disk on my macosx 10.4.6.
At first it worked well on both servers. After a while, the mounted icon simply disappeared. Try as I may, neither server mounts my external LaCie or any USB device for that matter.
I reinstalled OSX on one of them and when i connect it now it is correctly mounted, including usb device.
But on the other identical server on which i did not reinstall OSX it still doesn't mount.
Nevertheless, in the system information panel, fire wire, there is a line stating "la cie external drive" blah blah, but without specifiyng size and the disk is not accessible, no icon on the desktop and so on.
I tried shutting off for 20 min, with every cable unpluged, I tried updating but still it does not mount.
if any of you had this problem and would like to share with me the solution it would be really great !
thanks in advance

These are the most common reasons for one computer to work with an external drive while another does not (assuming the cable is the same), all of which are covered in my FAQ mentioned earlier, which perhaps I should outline like this:
1. The PRAM needs zapping. Note, if a machine is 3 or more years old, PRAM zapping should only be attempted after verifying that the clock battery is fully charged at 3.6 V.
2. The firewire ports need resetting.
3. Dust in the firewire ports.
4. Installed firmware on the Firewire bridge of the hard drive is not fully compatible with the operating system. Check the manufacturer's support line (in this case e-mail firewire AT lacie.com) for updated firmware.
5. The operating system's Firewire drivers are not properly installed. This may happen if you used system specific disks for another Mac to install the operating system, or the directory is damaged, or the preferences for the firewire are not working.
I would test in that order.

Unwanted Duplicate Mounts of FireWire External Disk

Hi all,
I've been having this problem since Tiger, yet it continues through Leopard. Every time I plug in my i-Rocks 9300 series FW800 enclosure for my external 320GB drive, OS X mounts the disk twice if via FW800, which causes all partitions on the disk to become corrupt, forcing me to erase the disk cleanly. This doesn't occur if mounted via USB.
I have a sinking feeling that this is a problem with the firmware in the enclosure. I've tried most everything I can find about disk mounting in OS X. Modifying the fstab is no help, and it seems that there aren't any ways of controlling such behavior properly.
Any help is appreciated.

It does not have FW400, except via a 9-to-6 adapter and cable, and I don't have a 6-pin cable to test it.
I haven't been able to test it out on other Macs, yet.
Yes, I can eject one or the other, but more often than not, another system process has already written things to only one partition, thus causing corruption.
Have tried re-formatting to something other than FAT or HFSJ.
I think I may end up buying another enclosure, since the manufacturer's support team is useless.
Thanks!

My external drive won't mount. Disk Utility says it can't repair disk and to backup the disk and reformat, but how can I do that if it won't mount?

My external drive won't mount. Disk Utility says it can't repair disk and to backup the disk and reformat, but how can I do that if it won't mount?

See mount section in 1st linked article.
Disk Unmount Using Terminal
Disk Utility – Force Mount Disk

Unexpected disconnection external disk and different mount points

Dear community,
I have an application that needs to read and write data from an external disk called "external"
If the volume is accidentally unmounted by unproperly pluggin it off), it will remount as "external_1" in the terminal,
and my app won't see it as the original valid destination.
According to this documentation:
https://support.apple.com/en-us/HT203258
it needs a reboot to be solved, optionally removing the wrong unused mount points before rebooting.
Would there be a way to force OSX remounting the volume on the original mount point automatically?
or checking the disk UUID and bypassing the different mount point name (app or os level?)
Thanks for any clue on that.

See DUMPFILE

External disks will not mount on new OS install

Hi,
I just had to reformat and reinstall all the OS and applications on a imac g5 for a friend of mine. I have updated all the os to 10.5.8 and have installed user software iWork, iLife, Microsoft office and Roxio's Toast 10 and a family history software called Reunion. That is all that has been done to this new install.
I went to transfer her personal files back and I can't get any external disks to mount. They will all show in disk utility but will not mount the desktop. I have tried 2 different drives formatted in Mac OS Exteded Journalled as well as MS-Dos Fat32. I have also tried flash drives formatted in each of these formats. All of these drives are readable on several other computers I have here, including a 2008 Macbook Pro running Lion, 2010 iMac running Snow Leopard as so on.
When inserted in the iMac G5 I can see all the drives in disk utiltiy and was able to even erase and reformat a drive to differnt format ( mac extended to Fat32) without issues to mount on the other computers.
Cd's mount just fine.
Anyone have any clues as to what's going on? Any thoughts are most welcome.
Thanks
pax

BDAqua wrote:
What exactly shows in System Profiler>Hardware>USB for those drives?
Boot from the Install Disc & see if they show up, not grayed out in Disk Utility.
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
We were thinking along the same lines. While at home I dug up a firewire enclosure and put a bootable GUID formatted drive in it (that I had in one of the usb enclosures) and started her computer holding down the option key and then chose to boot from the external firewire. All usb drives are now mounting upon connection. I asume that her drive has bad sectors on it (even though the SMART status says it's OK) and is not loading all the drivers properly for USB to mount. I was suspicious from the beginning that the OS was corrupt when she first had me look at it. It was at that point that I booted it in target mode, connected to my Macbook Pro, and then CCC'd to a usb drive that I had. I then had a couple of difficulties installing the new OS. Should have known......
I am now going to put a new drive in it for her and she'll be up and running.
Thanks so much for your help and thoughts that got me thinking as well.
pax

Stop external disk from auto-mounting

This may sound unusual, but is there any way to suppress auto-mounting of an external hard disk?
I partitioned an external disk into three partitions, two of which just hold cloned, bootable backups of Macs before I re-installed them. I only keep these around for emergencies and in case I forgot to copy some data over, but I do not usually use them. In fact, I'd prefer to not mount them to prevent any possible tampering.
The largest part of this disk is set up for Time Machine though, so I keep it connected to my Mac. I only want the Time Machine partition to mount though. Is there a way to mark the two other partitions to not auto-mount every time the Mac starts up?

See Prevent a given partition from mounting at boot , How to prevent a drive volume from mounting , or Prevent Mac OS X from mounting a hard drive volume at boot as a start. Or do a Google search which is where the above were found.

External Disk Mount failed on mavericks

my disk was not ejected properly, and when I inserted the usb cable,
the disk couldn't be mounted D: but I don't understand why the Time Machine partition still works well...?!
please anybody has any ideas to fix the problem? I'm an animation student. all of my personal portfolios and works are all in this external disk

I guess it's not working

External Disk not mounting

I had problems (could no write a file to it) with a Seagate 3 TB ExFAT disk, connected by USB 3 to a Mac mini running Mountain Lion (10.8.5).
Disk Utility Verify told me to Repair and so I did, and it stopped in the middle of the Repair (I let it run overnight, having disabled all power saving ooptions in System Preferences).
After that, the disk does not mount.
1. Any idea how I can mount the disk?
2. Any idea what tool I can use to recover the contents of the disk?
Thanks

Sorry, but I did not capture the output of Disk Utility when I ran it and now the disk looks "dead". Does not mount, does not show up in Disk Utility.
I plug the USB cable in, I can hear the disk whirring sound, but nothing happens afterwards. Only the internal disk shows up. The cable is good because I tried it with another disk.
Now I found a Disk Utility Log:
2014-07-27 15:49:33 +0200: Verifying volume “disk2s1”
2014-07-27 15:49:33 +0200: Starting verification tool:
2014-07-27 15:49:33 +0200: Checking file system
2014-07-27 15:49:33 +0200: Checking volume.
2014-07-27 15:49:33 +0200: Checking main boot region.
2014-07-27 15:50:28 +0200: Error: This disk needs to be repaired. Click Repair Disk.
2014-07-27 15:50:28 +0200:
2014-07-27 15:50:28 +0200: Disk Utility stopped verifying “disk2s1”: This disk needs to be repaired. Click Repair Disk.
2014-07-27 15:50:58 +0200:
2014-07-27 15:51:37 +0200: Verify and Repair volume “disk2s1”
2014-07-27 15:51:37 +0200: Starting repair tool:
2014-07-27 15:51:37 +0200: Checking file system
2014-07-27 15:51:37 +0200: Checking main boot region.
2014-07-27 15:52:48 +0200: Volume repair complete.
2014-07-27 15:52:48 +0200: Updating boot support partitions for the volume as required.
2014-07-27 15:53:15 +0200: Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
2014-07-27 15:53:15 +0200:
2014-07-27 15:53:15 +0200: Disk Utility stopped repairing “disk2s1”: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
2014-07-27 15:53:46 +0200:
After this I lost all access to the disk.
Is there any console command or utility that can mount the disk?

How do I mount a disk image that won't open?

I have an external drive Samsung 500 GB that was failing. I think my MacBook Air (10.6.8) caused it to fail because it wouldn't allow me to eject the disk even though I forced quit all programs. I eventually had to just unplug the drive and this caused the external disk to fail as it had not been ejected properly. Not my fault. It's the MBA's fault for not letting me eject the disk. Now the Samsung disk won't mount properly and I get a message that the drive is failing and I should save the data.
Anyhow, I used the free version of Data Rescue 3 to try and save the data on the failing Samsung 500 GB drive and move it onto a brand new Toshiba 1 TB drive.
I was unable to use the normal scanning function of Data Rescue 3 as the hardware of the drive was too damaged, and so I used the clone function on Data Rescue 3 to clone the data onto a non-failing hard drive, with the intent of restoring the data later.
I am not sure if I was successful in making the disk image. It hung up at the 99.6% point for about 12 hours when I decided to give up on it, and I shut down Data Rescue so I could eject the hard disks.
However, it would not let me do it. I tried force ejecting but still I could not eject the disks.
I ended up just unplugging the drives. I think the Samsung drive died almost completely then because it made a whole lot of clicking noises after that (it was only making a few clicking noises before that).
Anyhow, I plugged the Toshiba 1 TB drive into the computer again and used Data Rescue to scan the drive with the disk image on it to see if I could detect files on that drive.
It opened up the structure and I was able to see that most or all of the files were there (abbout 450GB of data) just from seeing the information about the files in the structure tree - the labels of the files (file type labels such as jpg, mp4 etc) and the size of the files, although I could not open up the files to check all of them.
I tested out the restore function of Data Rescue by downloading one file (<10MB) file. I am using the free version and can download one file for free to test things out.
It worked and I was able to save that file onto a second external drive (Western Digital 500 GB) I had plugged in. I had bought this drive just to do the data rescue.
So I think the files are salvageable and the disk image is OK.
However, when I tried to open the disk image in Disk Utility, by opening it as the source and choosing the WD drive as the destination I could not open it. I got an error message. I can't remember what the message was.
I tried just opening the disk image in Finder by just clicking on the disk image but it won't mount.
Is that because my hard drive doesn't have enough space? My Desktop on the MBA only has 12 GB free and the WD drive has only 500 GB on it even though the disk image is about 501 GB.
I don't know why the disk image is that size when the failing Samsung drive only had 450 GB of data on it.
Anyway, what should I do to mount the disk image?
I want to mount the disk image so that I can copy or move the files from it to another external drive so that I can save those files.
Is it because the WD is only 500 GB or does it mean there's a problem with the disk image I made?
Should I try Carbon Clone Copy? I use that to make backups of my MBA internal HDD though I have never used it for opening or making disk images.
I have never dealt with disk images before except for dmg files of applications downloaded from the internet.
I am trying to avoid using Data Rescue 3 as I have to pay for it and if there is a free option, such as Disk Utility, CCC or other, I want to try it to restore the data in the disk image.
Sadly, I think the Samsung drive is ruined beyong repair as it's making a lot of clicking sounds and doesn't mount properly in Disk Image and I get a message that it's beyond repair or something like that in Disk Utility.
So I am relying on the disk image I made on the Toshiba drive to restore my files.
(I think it was the last movie file that caused the problem because it was when I was trying to copy it onto the Samsung external drive, all the problems began - hanging up when copying it, not being able to eject the Samsung disk, causing hardware issues on Samsung disk and getting warning messages on Disk Utility.)
BTW, I learned how to eject a drive when it won't eject the normal way, I have to use command window and type in commands, but that's another post ....
Any advice?
I am thinking of going out and buying a second 1 TB external drive so that I have a disk with enough space to open the 501GB disk image on it, just in case that was the sole problem.
However, I am not sure that is the case, and I think there may be a problem with the disk image or I am not going the right way about opening it.
Thanks for any advice.

I think I've found the solution to this problem.
http://superuser.com/questions/19426/im-unable-to-mount-a-dmg-getting-a-no-mount able-filesystems-error
I am following the instructions here:
I ran into a similar situation. I did what simonair suggested and I received a message in Terminal that Volume mounted successfully. However It did not help me access the mounted Volume neither was I able to confirm the mounted Volume. Nor was I able to mount the image using Disk Drill or even scan through. Nothing succeeded.
Here is what I did to solve my problem. I see that in this post some suggested that we should convert name.dmg to writable file. I used the command from Terminal to convert but was not successful. INSTEAD alternatively, I used Disk Utility, attached the Volume (yes I got the same message again, ''no mountable system files'' however, Disk Utility nevertheless attached the image, which I was able to do before anyways. This time, I selected it and then clicked New image, and then selected image format read/write, not the compressed option. I created a new image. This time this image was writable however, it still would not mount using Simonair's solution. However, this time I was able to scan it with Disk Drill with exact file locations and folder hierarchy as I had. Recovering all from thereon was a breeze. Just remember: when you create new image of an attached volume and chose not compressed but read/write, you need to have a disk with exact amount of space that totals the total space allocated within that name.dmg file (not the amount of space the data takes). Mine was huge, and luckily I had an external disk with enough space to do that and it took about 5 hours for about 400GB of disk allocation. Good luck.
And so far it seems to be working. Even though the volume is grayed out on the left side of Disk Utility, I am still able to select it as the source for making a new disk image. I chose Read and Write and no compression.
The only thing I might be doing differently is that instead of choosing the disk image as the source, I chose the volume as the source. The volume is grayed out, but the disk image is not.
It seems to be working all right. Keep my fingers crossed.
If this doesn't work, I will use Data Recovery 3 as a last resort.

Can i put my itunes library on an external disk?

hi,
i want to store my itunes library on and external disk but want it to work just like it does on the internal hdd. is that possible?
i tried to store it on a home server. and while i could play the contents of the library. the art-work and so-forth did not appear in the itune client.
please advise.

Yes, it's most certainly possible. The easiest way is to just drag the entire iTunes folder (the entire folder, not just the iTunes Music folder) to your desired location. Then hold down the Shift key while launching iTunes. You'll be given a dialog box where you can select the iTunes library you want to use. Navigate to and select the iTunes folder in it's new location. Note that this procedure assumes that all of your content is contained in the iTunes Media/Music folder. If things are scattered around your drive, moving them becomes much more complex.
Once you get things moved successfully, be sure not to launch iTunes with the external drive not mounted or iTunes will default back to the internal drive. If it does, though, just mount the external drive and launch iTunes with the Shift key again.
Regards.

How do I clone an external disk using CCC?

I have a MacBook Air and because it has only 256 GB and I need about three times that space for storing movies, document files etc., I use an external hard disk to keep these files on.
I formatted this disk using Mac Extended Journal but I did not put the Snow Leopard Operating System on it. I just move files from the computer's hard drive to the disk as required.
I had a scare once where the data on another external hard disk was wiped out because of a faulty USB cord. All the movies were lost and I could not recover the data. The disk also failed to mount. This problem kept happening several times. When I got rid of the faulty USB cord, the external disk mounted and I never lost data again. I am certain all the problems were due to the faulty USB cord. I have been using the same external disk ever since and it has been working fine with the non-faulty USB cord so I am sure it didn't have anything to do with the disk and it was the USB cord that was the problem. I used the same faulty USB cord with other external disks and the same problems arose - failure to mount etc.
This is the background for why I want to make a copy of this external drive. I don't want to lose the movies and other data on this disk if something goes wrong again and want everything on another disk just in case.
I usually use Carbon Copy Cloner to make backups. But that is with a external disk that has OS 10.6.8 on it.
I really don't want to put OS 10.6.8 on the external drive where I store movies and other over-spill data on it.
How do I go about making a copy of this external disk using CCC (or using another program if CCC won't work for this)?
I have two USB ports on my MBA. I prefer to use CCC over SuperDuper because I had a problem with SuperDuper in the past.

So as I understand it, CCC will clone any disk to any disk so long as it's formatted to Mac (extended Journal) and I don't have to put the Mac operating system on the disks that I am copying from and copying to?
Thanks for answering.

How do I make a backup of an external disk?

I have an external disk that is formatted in Mac Extended Journal on which I keep movie files and photos.
I had some bad experiences in the past with my first MacBook Air (version 2.1) in which external drives kept getting erased without any good reason. I think it's due to the fact that I had to connect a USB cord to another computer when I had an external drive plugged into the MBA because the MBA could not power it on its own.
I thought it was due to a bad external drive and I took it to Samsung service center and complained that their drive was malfunctioning. I got a refund. But later on, I found that the same thing happened to another external drive and to a USB flash drive, so I realized that it had nothing to do with the external disks and something to do with the computer. I used the same drives that got erased on a newer MacBook Air (version 3.2) and I never had the sudden erasure problem.
Anyhow that's the background to why I want to make a clone of the external disks in my possession. If for some reason, the external disk gets suddenly erased, I would like a copy somewhere in safekeeping so that I do not lose all my movies.
How do I make a clone of an external disk?
I will be using a MacBook Air (3.2) for this task. It has two USB ports. Can I use Carbon Copy Cloner to do this? Just choose a source disk (external disk I want to clone) and a destination disk (the external disk where I want it to be cloned to)?

Many backup utilities like Carbon Copy Cloner and Super Duper can be used to clone drives. They can also clone boot drive to make bootable clones. They use "smart" backups in that they only update what has been changed from the previous backup. That is what you need too since you intend to use USB which is not that fast.
With CCC you can set up a task to start the backup automatically when you plug the backup in and it mounts.
FWIW I use CCC to make daily backups of my disks (scheduled backups can be done by these utilities).

Mounting External Disks[freeagent]

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