Explain "Single Disk Mode" + Adding new disk?

***I have already read all other potentially relevent posts on this site** (at least I believe I have)
I have an existing NMH300 with a single WD 1TB drive installed and configured for Linear1 RAID.
My apologies for asking a question that may be an easy answer, but after searching on the message boards and reviewing all the user guide material I still have a few basic questions.
Is it possible to operate in "single disk mode" with two drives installed? Seems like a dumb question based on the obviousness of "single disk mode," but it wasn't clear to me. I'd like to avoid Linear2 RAID b/c I don't want a single drive failure to ruin all the data in both drives and I want the capacity so I don't want RAID1.
I believe I understand that if I revert to single disk mode from linear1 then all data is erased. Correct?
Would it really just be easier to add the 2nd disk and have it run in linear2 and avoid all the hassle of a migration and re-build?
One last question. If I add the 2nd disk and configure it in linear2, the NMH is supposed to keep my existing data on the existing drive and just "add" the capacity. Correct? (I know I should back it up first, but just asking to make 100% I understand the specific details)
Thanks.
/ctizzle
Solved!
Go to Solution.

Hi ctizzle,
So that all these modes will not confuse you I suggest checking out this link. Since I've got my videos and music backed up on another drive and I use my nmh primarily as a media server I set mine up as linear2. If you decide to increase your total disc space by adding another hard drive and set up the nmh on linear 2 mode as well then I suggest you take a look at this guide.
By the way, choose your hard drives from the hardware tested list.
Hope this helps!

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How to mount USB & CDROM drives from single user mode - Solaris boot disk?

Hi All,
I need to carry out ufsrestore on a single newly replaced system disk (no redundancy / mirroring) from either USB or CDROM drives from the following steps:
( i ) GRUB => e, e, cdrom –s, Enter, b (boot from Solaris 10 x86 media).
( ii ) Choose menu 1 for Install Solaris Interactive Mode to reach single user mode.Below are the commands that I have tried in single user mode without success:
mount –r –F pcfs /dev/dsk/c1t0d0p0 /cdrom (after unmount Solaris CD)
mount: /dev/dsk/c1t0d0p0 is not a DOS filesystem.
svcadm –v enable smserver
svcadm: Pattern ‘smserver’ doesn’t match any instances
svcadm enable autofs
svcadm: Pattern ‘autofs’ doesn’t match any instances
devfsadm
devfsadm: mkdir failed for /dev 0s1ed: Read-only file system
mkdir /mnt
mkdir: Failed to make directory “/mnt”; Read-only file systemPart of the problem is due to the current READ ONLY filesystems which does not allow the creation of mount point such as /mnt.
I have been able to create both / root (/dev/dsk/c1t0d0s0) and /export/home (/dev/dsk/c1t0d0s0) filesystems with newfs that are awaiting for restore using ufsrestore.
The only option I am left with is to attach a secondary disk to install Solaris 10 on either of them before bring the system to multi-user mode so that service such as volmgt, autofs, volfs are available to access USB & CDROM drives.
Any suggestion on how to resolve this issue?
Many thanks,
Jack

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
making use of all the disk device management services such as the following services only available in a fully installed Solaris system (both single & multi-user modes) installed on the
primary disk:
# svcs smserver
STATE          STIME    FMRI
online         Jun_08   svc:/network/rpc/smserver:default
# svcs autofs
STATE          STIME    FMRI
online         Jun_08   svc:/system/filesystem/autofs:default
# devfsadm
# iostat -En
c1t0d0           Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
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
# rmformat
Looking for devices...
     1. Volmgt Node: /vol/dev/aliases/cdrom0
        Logical Node: /dev/rdsk/c0t0d0s2
        Physical Node: /pci@0,0/pci-ide@1f,1/ide@0/sd@0,0
        Connected Device: PHILIPS DVD+-RW DVD8801 AD21
        Device Type: DVD Reader/WriterHowever, I was disappointed that "iostat -En" has not found the secondary disk (1 TB) even though it was available earlier, for Solaris installation as the only disk on the same system.
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

Target Disk Mode on new MacBook Air - where to find Thunderbolt to Firewire cable?

I use a MacPro desktop with a RAID set-up at home, and will use the new MacBook Air on the road. I need to use Target Disk Mode when I return home to sync my Macs. The MacPro only has Firewire 400/800; the new Air only Thunderbolt. Does anyone know how to find a Thunderbolt to Firewire adapter, please?

I, too, would like a TB<->FW adapter, but I'll wager that for 99% of those purchasing a new MBA it is not an issue let alone a serious ommission.
For the rest of 'us' (the remaining 1%) Sonnet has an adapter listed with info due 'later this summer' as to pricing/availability so as Waymen has already stated it may be a while before we see one.
In the meantime, I'll use a combination of USB2 drives (one of my dozen or so USB2 drives--120GB to 1TB--I have lying around), an Ethernet cable, SuperDrive, or AirDrop. Not as convenient but a usable work around.

Disk mode and new computer

When I turn my iPod onto disk mode, it remains at the screen "ok to disconnect" with a checkmark indefinately. It doesn't matter if I plug it into the wall of computer or whatever. I turned it to disk mode to transfer my music onto a new computer, but that doesn't work either. I'm horribly confused. Can anyone help me with either problem?

To get it out of disk mode and remove the check mark, simply reset it.
To transfer the music to a new computer using the iPod as a hard disk, see this.
How to use your iPod to move your music to a new computer.
You'll notice that it's a different method of enabling disk use.

Adding new disks

What is the command in solaris 9 to add a disk without running boot -r or /reconfigure.
I know there is a command which will add/install a new disk. I just can't remember :(
tks,
pio

If this is a SCSI disk then devfsadm should be sufficient enough. If it's a fibre-channel disk then you may need to use cfgadm.
Using cfgadm for fc disks is covered in the manual: "Sun StorEdge� SAN Foundation Configuration Guide" availible from http://www.sun.com/storage/san

MacBook in target disk mode shows incorrect disk size

My 80 GB hard drive in MacBook has gone bad (the filesystem is in inconsistent state). I connected it to an iMac in Target Disk Mode. It shows up (unmounted) but the capacity reported by Disk Utility is 20 GB. Does someone know why is that? Is it due to the corrupt filesystem?
I am afraid that given this situation, if I buy and run DiskWarrior, that too might not be able to see the full disk and fail to repair it. Note that if I boot my MacBook using the Apple CD, the Disk Utility shows the correct disk size.
Thanks.

If you have a disk that is in really, really bad shape to the point that Disk Utility looks at you like a 5 year old that just spilled a glass of apple juice on the kitchen floor, it's time to bring in the big guns.
DiskWarrior.
I love it, I love it. If someone has something bad to say about it, they are lying. If there is a chance that you can get everything back to normal without spending the huge dough to send your drive out to be dismantled in a clean room, DiskWarrior is that chance.
It's worth every single penny.
Let me know if you have other queries.

Target Disk Mode - 2 Hard disks

I would like to be able to access the files on my old G4 easily with my new iMac. I have attached the two with a firewire cable, booted the iMac normally and then booted the G4 to target disk mode by holding t. I get the firewire symbol on the G4.
The G4 has 2 hard disks but only one of them is mounting on the iMac (the secondary HD is mounting, the HD with the OS is not mounting). Any ideas?

OK so method two is to use a network cable straight from the G4 to the iMac and power up the G4 normally. I can see both HDs now from the iMac, great. Now however the internet connection (supplied over wireless) has dropped from the iMac whenever the two are connected?

Keeps corrupting disk partition, even new disk

After 6.5 reliable years, my Macbook Pro (mid-2007 model 3,1) failed to boot, just freezing at the white screen (in Mtn. Lion) even when the shift is held down for "safe boot". Although Disk Utility and Apple Hardware Test found nothing wrong with the hard drive, I replaced it along with the battery with brand new ones. Since then, no matter what OS X version I load (10.6.8, 10.8, Mavericks), the same problem occurs without warning after 2 or 3 weeks of normal use.
Disk Warrior finds one or two damaged, seemingly non-crucial files each time, but their removal does not correct things. I partitioned the disk last time, and loaded Snow Leopard onto both so I would have a spare. Also fixed permissions. But sure enough, after a couple of weeks the partition most used is not openable while the other one still operates beautifully, no twirling beach balls or anything. But I know it's living on borrowed time.
Can a logic board crap out after years pass and permanently corrupt a disk partition while leaving the rest intact? Could a failing PRAM battery do something like this?

Could be that your new disk is also borked, but I would try getting a new SATA cable in the meantime.
Good luck!

4GB nano seems to be stuck in disk mode, shows as disk but no itunes

So my 4gig nano will mount in windows but will not show in windows. I've reset the thing about 20 times, restored with latest updater over and over again, tried forcing it into disk mode and then resetting it, but everytime I connect it to my win xp computer it will mount but not show in itunes. I've tried 3 different windows PCs and one was a fresh install. All have latest itunes. The ipod seems to work perfectly in all aspects except it will not show in itunes. Any suggestions?

"So my 4gig nano will mount in windows but will not show in windows."
Eh?
Try these. You may not have seen the last two.
iPod appears in Windows Explorer but does not appear in iTunes.
iPod does not appear in iTunes.
Fast user switching in Windows XP is not supported.
Strange iPod behavior.

Target disk mode from newer iMac to old G4 Mac???

Hi:
We have a several year old iMac (2.66 GHz Intel Core i5 running OS 10.9.4). I have a much older (2001) 867 MHz G4 Mac. I'd like to recycle the latter (which I haven't used in many years), but before doing so I want to make sure the internal disks are wiped clean.
I connect it to my iMac with a FireWire cable and boot it up in target mode by holding down the "T" key. Surprisingly (to me, at least), nothing shows up on the desktop of my iMac. But if I go to Disk Utility, it is listed in the available disks under "AAPL FireWire Target Media", with the properly named internal hard drive listed as a sub header (id est, "My Computer"). Three problems (really one, but more data for trouble shooting):
1) If I try and mount the internal disk on the G4 onto my iMac with the "Mount" button in Disk Utility, the error says "Mount Failed: The disk "My Computer" could not be mounted. Try running First Aid on the disk and then retry mounting"
2) If I click "Verify" "My Computer" I get "The volume "My Computer" was found to be corrupt and needs to be repaired. Error: This disk needs to be repaired. Click Repair Disk.". But, the "Repair Disk" button is greyed out. All options are also grey if I click the top most hierarchy: "AAPL FireWire Target Media"
3) Under the "Erase" tab in Disk Utility, both "AAPL FireWire Target Media" and it's sub header "My Computer" all options are greyed out.
Bottom-line, the disk is shown in target mode in Disk Utility, but I cannot seem to access it to Secure Erase it.
Any advice would be greatly appreciated! Thank you.

Thanks to both of you for your help with this interesting problem!
After secure erasing the internal drive on the G4 using a copy of Disk Utility on a CD as described above, the internal drive on the G4 DOES mount on my Mavericks iMac. Don’t know why erasing it changed things, but it did.
So then I ran the command lines in Terminal you suggested:
[HomeG4-2:~] MyUID% sudo chflags -R nouchg/Volumes/IntSml
usage: chflags [-fhv] [-R [-H | -L | -P]] flags file ...
[HomeG4-2:~] MyUID%
[HomeG4-2:~] MyUID% sudo chmod -R 755/Volumes/IntSml
usage: chmod [-fhv] [-R [-H | -L | -P]] [-a | +a | =a [i][# [ n]]] mode|entry file ...
chmod [-fhv] [-R [-H | -L | -P]] [-E | -C | -N | -i | -I] file ...
[HomeG4-2:~] MyUID%
And then I ran diskutil list as you suggested:
[HomeG4-2:~] MyUID% diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS iMac HD               959.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data                         40.0 GB    disk0s4
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     Apple_partition_scheme                        *122.9 GB   disk1
   1:        Apple_partition_map                         32.3 KB    disk1s1
   2:                  Apple_HFS IntSml                  122.8 GB   disk1s3
[HomeG4-2:~] MyUID%
But despite all this, even though the disk now mounts, all options within DiskUtility for Erase are greyed out.
Anyways, it was an interesting learning experience and I appreciate your interest.
And just in case anyone else is reading this, if you google apple computer recycling program one gets a lot of options for recycling. Since I figured this old PPC would have very little worth, I used http://oem.srsapp.com/ApplePoweredBysims/default.aspx where they give you a shipping label and you can send your old box for green recycling and keep toxic metals etc out of the landfill.
PS Any idea why even after secure erasing the G4 disk, writing multiple zeros, the drive still has two files on it accounting for 54MB of data out of the 123GB of data on the disk??? What does this represent?

Copy Disk Image to New Disk Image

Hi. I have a disk image that is in sparsebundle form and has a total size of 9.61gb. When I mount the image, it results in a volume with 8.53gb used and 15.97gb capacity. Let's say that I wanted to move this entire volume to a new partition that is only 10gb in size. I should technically be able to do this since the files only take up 9.61gb, right? I can't seem to move it to a new volume, or disk image with a capacity less than 15.97gb. Is there a way that I can work around this? Basically I just want to create a new volume with total capacity approx 10gb and copy the files over. I tried using disk utility and restoring but I keep getting an error about not enough space. Any thoughts would be helpful, thanks!

See if you can reduce the size of the existing sparse bundle, per #A8 in Time Machine - Troubleshooting (or use the link in *User Tips* at the top of the +Time Machine+ forum).
Then you should be able to just drag & drop the sparse bundle to the new volume.

I want to transfer all my bookmarks from an old disk to a new disk. What file(s) do i need to copy?

I had lots of bookmarks on my old computer. The disk from that computer is currently a slave drive on my new computer as I'm transferring data. I've installed firefox on the new computer. Now I need to transfer all my bookmarks to the new computer's disk. What file(s) should I copy to get my old bookmarks on the new computer?

Thanks Bug Follower. it worked. Phew!
Something tells me simplifying this job for novices like me would be a good feature for the programmers to add.

Disk utility caps new disk images at 13 in pwd

This sounds crazy, which is why I'm posting it here. I'd love it if someone could try this because I've tried it on two different Mac Mini's (macmini3,1 - aka, 5 usb port version) and the same results. Snow Leopard 10.6.4, fully up to date.
I am making disk images of all the software the faculty here at the university will need to install. Using the GUI version of Disk Utility to create them. So far, three times this has happened. Each time at 13 items. Note that this is 13 ITEMS, not necessarily .dmg's. I tried consolidating dmg's into subfolders during the third go-around, but once the folder I'm dumping all the dmg's into reach 13 items (dmgs, subfolders, whatever), Disk Utility errors out during creating the next dmg.
If someone wants to try this, I'd love to hear the results.

The type of disc being made into a disc image doesn't matter. I'm doing this to back up university software for internal use only, but I've tried it with other content as well.
Storage is not the issue. This is a fresh install of Snow Leopard, with 160gb or so free. the first 13 disc images took about 9gb of space, the second set maybe about 20gb, and the third set about 15gb. Both df -h ./ and Finder's GET INFO show plenty of hard drive space.
This happened after the initial 13 discs and every 13 discs thereafter; no data is moved off the harddrive, it just needs to be moved out of the folder I'm dumping the images into. This is a valid workaround, but it feels like something is wrong.

Target Disk Mode Backup

The hard drive on my 12" powerbook g4 is failing and I need to do an emergency backup. I've pulled all the important data off and now I'd like to make a disk image backup so that I don't lose my preferences, fonts, etc, etc.
I'd thought to do this by putting the powerbook into target disk mode, mounting the disk on a friend's powerbook, and then using her disk utility feature to create the new disk image on another, external drive. Her internal drive isn't large enough to hold the disk image.
But reading the apple how-to, it seems like you can't have another firewire connection active when you've got a computer hooked up in target disk mode. Is this so?
Is there any way I can create this disk image backup and get it on my external drive without booting up the failing powerbook?
powerbook g4 Mac OS X (10.4.6)
powerbook g4 Mac OS X (10.4.6)

Hi, oligopisto. Welcome to the Discussions.
The instructions for Target Disk Mode are very specific. I've not tried using a FireWire drive while having another Mac connected in Target Disk Mode. While Apple doesn't state the reason, I'd take them at their word. If the instructions state not to do it, I'd follow their advice.
I presume you only have one FireWire drive, that it's not partitioned, and that you've used that drive to save the data you've backed up from your PowerBook?
If that's the case, then here is a suggestion for an emergency backup procedure:
1. First, using your friend's Mac, see if you can create a disk image of the data on the FireWire drive that you can save on her computer. You need to do this to save the info you've already backed-up to the FireWire drive before proceeding.
2. Open the Get Info window for the FireWire drive and see if the "Ignore ownership on this volume" checkbox is selected in the General pane. If so, uncheck that checkbox.
3. Eject the FireWire drive from your friend's Mac (drag its icon to the Trash), then power off the FireWire drive and disconnect it from her computer.
4. Connect your FireWire drive to your PowerBook and power-on the FireWire drive.
5. Startup from your Tiger Install DVD.
6. Select Language.
7. After the Installer window opens, select Utilities > Disk Utility. You should see both the FireWire drive and the PowerBook's startup disk (e.g. Macintosh HD) in the column on the left side of the Disk Utility window.
8. In Disk Utility, select Macintosh HD.
9. Select the Restore tab.
10. Drag the Macintosh HD icon from the left column to the Source field in the Restore tab.
11. Drag the icon of the FireWire drive's volume to the Destination field in the Restore tab. Your FireWire drive will show up in the left column as:<pre>FireWire Drive Device Info
FireWire drive's volume</pre>The FireWire drive's volume is below and slightly indented with respect to the FireWire Drive Device Info. It's listed with the name of your FireWire drive. That's what you want to drag to Destination.
The first a screen shot in this article will give you some idea of what things should look like.
12. Select Erase Destination. Note: This option will result in the FireWire drive being erased after the next step.
13. Click Restore. Disk Utility begins to copy your entire Macintosh HD to the FireWire drive's volume. This may take several hours depending on how much data is on your PowerBook.
14. When Disk Utility has finished, Quit (Command-Q) Disk Utility.
15. Quit (Command-Q) the Installer. When prompted, select Shutdown to shutdown your PowerBook.
16. After your PowerBook shuts down, power off and disconnect the FireWire drive.
17. Check the files on the FireWire drive using your friend's Mac. If done correctly, you may even be able to startup her Mac from the Backup using Startup Manager. However, given that your PowerBook's hard drive is dying, you'll need to be satisfied with whatever you can get off of it. For example, if the OS on your PowerBook is corrupted, you might get your data files, but the drive won't be bootable.
18. Copy the disk image from your friend's Mac, created in Step 1, to the FireWire drive.
19. Eject the FireWire drive from your friend's Mac (drag its icon to the Trash), then power off the FireWire drive and disconnect it from her computer.
Your FireWire drive should now have both a copy of whatever could be recovered fro, your Macintosh HD and the disk image you created in step 1.
After you get your PowerBook's hard drive replaced, I suggest you implement a comprehensive Backup and Recovery solution. For advice on the backup and recovery solution I employ, see my "Backup and Recovery" FAQ.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

G5 won't boot but will go to target disk mode

Hi,
Well it started like this: suddenly a dark grey veil lowered across the screen with a notice in several languages saying "you must restart your mac" (or something to that effect). I panicked and pressed the power button, the mac shut down.
I started it again but it only got as far as the grey Apple screen and then sat there for a while until the fans started ramping up in the famous jet engine style. I shut it down again.
I have tried starting it:
In single user mode = no joy, same as above
In safe mode = some text on a black background, keyboard not functional, fans start going crazy again.
In target disk mode = everything exactly as one might expect, all files accessable, fans ticking over normally.
I have attached an ibook to it, booted the G5 in Target disk mode and run disk utility, repair, but it reported the disk "could not be unmounted". There was a lot of clicking from the G5 though so I assume something happened. I then ran "verify" and it reported that everything was fine.
The G5 still won't start, exhibiting the same symtoms as before.
Anyone got any ideas?
Cheers,
Cliff

Hi Cliff, and a warm welcome to the forums!
See if any of this gives us more clues....
How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436
Earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
PM G5 won't start...
http://support.apple.com/kb/HT2173

Explain "Single Disk Mode" + Adding new disk?

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