Creating RAID doesn't work using Disk Utility

When I try to create a RAID in Disk Utility, the pair gets corrupted and I get an error - "couldn't find RAID".
What is missing? Is there something else to install?
I'm trying this on an external USB drive.

I gave up.

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Builidng RAID on mac pro using disk-utility

Hello,
i want to build a RAID on my Intel mac.
First idea was using Disk Utility (DU).
Is DU able to create RAID 5 or only RAID 0/1 ?
If yes, and hints / or useful links ?
I have googled for a while but most hints are regarding raid 0/1 and/or mac xserve systems with specific cards/controllers
or should i use: softRAId app ?
and:
if there is a solution:
is the software raid 5 at apple really too slow to be happy ? is hardware-raid the only working solution ?
best regards
fidel

Check out some of the PCIe hardware controllers. There is CalDigit
RocketRAID reviewed by AMUG (they do excellent in-depth reviews).
Areca ARC-1220 RAID might be an option at some point. Would be nice if it did - but I don't see Mac Pro or OS X support.
http://www.areca.com.tw/products/html/pcie-sata.htm
I prefer SoftRAID, but you'll have to wait for 3.6, or do as some and use Apple's and create RAID 1+0. Or XRAID

Getting medium write error on burning a disc image using Disk utility

Have a MacBrook Pro 15 inch, circa Summer 2007, using OX 10.4.11. up until recently (as in before February) have been able to burn DVD's using Toast (message Medium Writer Error). Started getting problems where the burn failed. Thought maybe it was Toast, so I tried creating an iDVD project and tried to burn the DVD using that, and it stopped in the middle as well and then spit the disk out with no error message.
, this time I tried creating a disc image, and used disk utility to burn. The process looked like it was going to work but then failed with a message that I have a medium write error.
I have no problems burning a regular data disk on my superdrive so I am thinking it's maybe a software glitch rather than hardware. . Any thoughts, as to what could be causing this problem all of a sudden. By the way, there are other users out there, who seems to be having DVD burning problems all of a sudden, but most people suggest other media. I am using the same stack of DVD-R's from before when I had no problem.

Well, I had assumed my media was ok, since I had a spindle of DVD-R's and had used many of them successfully (until now!, ha ha).
I went out this afternoon and bought another brand (Memorex) and it successfully recorded.
So hopefully this solves my problem, I had no idea it was the media since I had used several of them before.
Thanks for your help.

The difference between a .dmg file & a .cdr file (using Disk Utility) ?

Hi,
In particular, I created both from a DVD using Disk Utility.
When I chose "read only" a .dmg was created.
When I chose "DVD/CD Master" a .cdr was created.
They are exactly the same size.
Is there any difference ?
Thanks in advance.
Pat De Marco

HI Pat,
From Wikipedia: A file with the extension .dmg (an abbreviation for disk image) uses a disk image format commonly found on Mac OS X. The format allows secure password protection as well as file compression and hence serves both security and file distribution functions. Its most common function is the distribution of software over the Internet. When opened, DMG files are "mounted" as a drive within the Finder.
From: Wikipedia .cdr and ISO
ISO image
Filename extension .iso
Uniform Type Identifier public.iso-image
Type of format Disk image
Standard(s) ISO 9660
An ISO image is an archive file (a.k.a. disk image) of an optical disc using a conventional ISO (International Organization for Standardization) format that is supported by many software vendors. ISO image files typically have a file extension of .ISO but Mac OS X ISO images often have the extension .CDR. The name "ISO" is taken from the ISO 9660 file system used with CD-ROM media, but an ISO image can also contain UDF file system because UDF is backward-compatible to ISO 9660.
Carolyn
Message was edited by: Carolyn Samit

Can a use a partitioned external hard drive to create a disk image? I tried, doesn't seem to work using disk manager.

Can a use a partitioned external hard drive to create a disk image? I tried, doesn't seem to work using disk manager.

OK, it's very bad computing to use a backup disk for anything but a backup. The reason being is if/when the HD crashes you will have lost not only all your backup but the data files. While I commend you for wanting redundant backup, you really need separate EHDs for doing so. Format each EHD using Disk Utility to Mac OS Extended (Journaled) using the GUID parttition. When you connect, OS X will ask if you want to use that drive as a Time Machine backup drive, select yes and then let it backup. On the second EHD format the same way however do not use TM as a backup, this time I'd suggest an app such as SuperDuper or Carbon Copy Cloner to make a clone of the internal HD. Leave both EHDs connected and TM will backup new or changed files automatically on a hourly basis. The clone you will need to set to backup on the schedule you want. For example I have my SuperDuper EHD set to backup only changed or updated files at 2AM every day.
The advantage of a clone is that if the computers internal HD crashes you can boot from a clone and continue working, TM will not do that but it's great for keeping an archive of all files. So if you want a version of a file from many months ago, TM will help you locate and restore it.

HT3275 I continue to get the following error message: Unable to complete back up.an error occurred while creating backup folder. It's a brand new drive. When I attempt to repair it using disk utility I get:unable to repair disk cannot unmounted

I have been trying to use time machine on a new lacie 2tb usb 2 drive for back up. I continue to get: "unable to complete backup.An error occured while creating backup folder". When I use disk utility to repair I get another error message: unable to repair disk unmountable.
Help me Obie One Canobie you are my last hope

I have confused myself with the facts! Started out keeping track of every step and every variable but have sort of lost it as we progress here. First I quit all applications then swapped connections between mouse port and backup disk port to influence possible bad connections question. Changed power outlet receptacle for the backup disk. Disabled the put-the-HD-to-sleep option. Then powered down the computerator.
Next started up computerator. Turned Time Machine ON and experienced multiple successful backups! Then I started up a few applications, Mail and Text Edit (but not Safari so far). Had a few more successes. After each backup, I used Disk Utility to verify the backup disk is still OK. This because the error about unable to unmount the backup disk seems to go hand in hand with Disk Utility finding the backup disk to be bad.
Put computer to sleep for the night. Upon starting up in the morning, and before doing anything else, I did a backup disk verification... BAD! Did a restart and verified the backup disk... OK.
Did a few Sleep-bad, Restart -OK repetitions.
It seems consistent: Sleeping the computer apparently messes up the backup disk but doing a Restart "repairs" it.
=============================
Now then, I don't understand everything I know here. Methinks that maybe keeping the HD from sleeping during lulls in activity has allowed successful backups through the day but manually putting everything to sleep for the night causes a return to the problem of spinning-back-up-too-slowly (which was explained earlier). Is there any truth in this?
I may abandon this Seagate thing for something more compatible. What's out there that we know works reliably for us?

My mac mountain lion dont boot , and dont repair using disk utility what should i do i have so important data on it .my window partation work perfact

hi ,]
last n8
i partatioon hard disk and install windows 7 using bootr cam ,
nw wt heppen my mac HD partation dnt start jst gray screen with apple logo appear and then some loading bar heppen and then shurt down
i tried to repair partation using disk utility
bt
cant repaird ..
so wht should i deoo..
my all data are on mac ..i have to back up .
how can i

There is no option for "DVD and CD Sharing" on a 2011 Mini because it doesn't have an optical drive to share. That option is available only on computers with an optical drive to share.
That option is used, on the other "donor" computer with an optical drive that you want to use/share. On the other computer you turn on "DVD and CD Sharing", allowing its optical drive to be shared. Then on the Mini you connect to it with "remote disc".
I believe you're thinking about the "DVD and CD Sharing" System preference in reverse; you activate it on the computer whose optical drive you want to use/share, not on the Mini without an optical drive.
See the following which explains how to set up and use remote disc: http://support.apple.com/kb/HT1777?viewlocale=en_US

I erased my windows partition using disk utility then realized I should have used boot camp, because now I can't resize the original partition and seem to be stuck with a ghost unusable space. Boot Camp now doesn't give me the option to install or re

I erased my windows partition using disk utility then realized I should have used boot camp, because now I can't resize the original partition and seem to be stuck with a ghost unusable space. Boot Camp now doesn't give me the option to install or remove windows partition.

Hi, Ralph,
The problem is that I did erase the partition, using disk utility, but I can't go back to my original disk size pre-partition, as disk utility won't let me do it and gives the message "Couldn’t modify partition map because file system verification failed." When I try to use Boot Camp Assistant it won't let me select the third option to remove windows.

Can't create disk image using disk utility

Recently,i have been trying to backup my DVDs and CDs(mainly movies) using disk utility.To my disappointment, i wasn't able to create a disk image despite several attempts using dual-layer DVDs,normal CDs,single-layer DVDs.
It is so frustrating.....i can't figure out what went wrong.
Can anyone help me in this?
Macbook Pro 15.4' Mac OS X (10.4.8) Core 2 Duo 2.16 GHz

BadPenn,
Welcome to Apple Discussions.
By any chance, do you use Norton AntiVirus? If yes, turn off Auto-Protect.
Hope this helps.

Using disk utility to create a disk image then burn to an external drive

I have an iMac which does not have the ability to burn my iDVD projects to a DVD. Can I save my iDVD proj. to a disc image? Then write that image to an external DVD writer via Disk Utility?

This is from _Disk Utilty Help_. Erasing a disk is the same as formatting it. These directions are for Tiger; check this topic in Leopard to see if there is any difference in the directions.
+_Erasing a disk or volume_+
+You use Disk Utility to erase disks and volumes.+
+Erasing a disk deletes all the volumes and files on the disk. Erasing a volume deletes all the files on that volume, but does not affect other volumes. Erasing a recordable disc, such as a CD-RW or DVD-RW disc, creates a blank disc with no formatting.+
+IMPORTANT: If you have any files you want to save, be sure to copy them to another disk before you erase the disk they are on.+
+Usually when you erase a disk or volume, Disk Utility erases only the information used to access the files on the disk, not the actual files. Because of this, the erased files can be recovered. If you want to erase a disk so that the files cannot be recovered, you can select security options to write zeros over the disk space.+
+If you want to erase an external disk, connect the disk to your computer.+
+In Disk Utility, select the disk or volume in the list on the left.+
+Click Erase.+
+Choose a format from the Volume Format pop-up menu. Usually you will choose Mac OS Extended (Journaled).+
+Type a name for the disk or volume.+
+If you're erasing a disk and plan to use the disk with Mac OS 9, select the checkbox to install the Mac OS 9 drivers.+
+You do not need to install the Mac OS 9 drivers to use the disk with the Classic environment.+
+If you want to erase the entire contents of the disk by writing zeros, click Security Options, then select the option you want and click OK.+
+Click Erase.+
+To erase your computer's startup disk, you must start up from another disk. You can use your Install Mac OS X disc.+
What does "journaled" mean?
Check this out for the answer. http://docs.info.apple.com/article.html?path=Mac/10.5/en/8835.html

Using Disk Utility to format jump drives to work on a PC?

I have tried several times to format usb jump drives using Disk Utility and then I copy files to it and try to open it on a Windows computer and it prompts me that it needs to be formatted on the Windows computer. How do I format it on a Mac to work on a PC? I have tried this with different usb drives using the MS DOS format option.
Thanks.

Dude,
Of course this isn't a jumpdrive but for externals...
There's a bug in Apple's disk utility software when using USB. I just had this happen to me too. The work around is to use Firewire when formatting. Fortunately, I have a multi port interface so changing to Firewire wasn't an issue.

Array created using Disk Utility keeps disappearing.

I've got a 4-bay Drobo unit that I use for my iTunes and iPhoto libraries. I recently ordered a handful of new 2TB drives to max out the capacity on it.
In order to keep all of my data intact, I installed a couple of drives in a spare 4-bay disk enclosure and used Super Duper to duplicate the Drobo files onto half of the new hard drives. I then pulled two drives out of the Drobo (a 1TB and a 1.5TB) and used Disk Utility to create a concatenated disk set in the spare 4-bay enclosure.
Next step was to use Super Duper to duplicate the libraries from the two new drives (still in the spare 4-bay enclosure) to the new concatenated disk set (also in the 4-bay enclosure).
When that was finished, I pulled the two new 2TB drives out of the 4-bay enclosure and put them into Drobo with the other new drives, fired it up, formatted, and told Super Duper to duplicate the libraries from the concatenated disk set (in the spare 4-bay enclosure) to the newly supersized Drobo.
Maddeningly, the concatenated disk set keeps "unmounting" and disappearing from the Finder - usually right in the middle of a copy operation. I get a handfull of folders and their files, and then "Poof!" it disappears. Restarting the Mac has no effect; I have to unplug and repower the hard drives.
I've got about 1,300GB left to copy over; I can't sit there for thirty straight hours and babysit this setup. Anybody have any idea why this keeps happening?

You don't have a problem and repairing disk permissions does not need to be performed daily or on a regular basis - only after installing software (especially after installing 3rd party software that uses an installer) and as a system troubleshooting procedure only.
Check Maintaining Mac OS X for recommended maintenance for OS X (which isn't much) focusing on the Maintenance Myths section.

I got 3.95GB available on my flash drive and need 4GB to reinstall lion osx how can i create space on usb using Disk Utility ??!

I got 3.95GB available on my flash drive and need 4GB to reinstall lion osx how can i create space on usb using Disk Utility ??!

What is the capacity of the flash drive?
You might also be able to reinstall Lion without a flash drive, by booting up the computer holding the Command + R keys, and choosing Reinstall OS X.

Using Disk Utility for Boot Camp to work

I'm trying to install Windows 7, but Boot Camp gave me the old error message about having unmovable data and needed to use Disk Utility to format it as a Single Mac OS Extended (Journaled) Volume. So I backed everything up and am ready to go, but when I open Disk Utility and select my hard drive/disk, all the options under "erase" are grayed out. Any ideas?
Thanks!

You can't format what you are using.
If you cloned your drive you would be able to boot from that; if you used another method and you don't have OS X installed on another hard drive, you have to use your DVD.

Reformatted ipod nano using disk utility - no longer works

Idiotically I decided to use disk utility to reformat my 8Gb iPod nano (5th Gen) as I wished to use it temporarily as a USB drive compatible with Mac and Windows. Now that I wish to use it again as Apple intended, I find that iTunes does not recognise it in the Source list.
It shows up fine on the desktop and when the iPod is charged, it always asks me to select a language, and then comes up with the menu screens (music, videos etc) but it is empty with no data.
I tried following the instructions in this support document http://support.apple.com/kb/TS3540 but was foiled at step 5 as I do not have the file they wish me to trash.
Any clues on how I might go about fixing this? I would very much appreciate any assistance!!
Cheers

Hello kismet_kracker,
Maybe trying reformatting it again via *Disk Utility* except this time, change it's file system type to Mac OS X Extended (Journaled) and see if that helps.
B-rock

Creating RAID doesn't work using Disk Utility

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