In attempting to use Disk Utility to make a.dmg image file archive of a volume on my Mac under Leopard. This site is not responsible for what they say. Fix 'Could not validate source' error when trying to burn ISO file to USB stick. I was trying to burn an ISO image file to my USB stick by Mac OS Disk Utility.

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Could not validate source - Operation not supported' kept appearing in Disk Utility as I tried unsuccessfully to restore a bootable USB flash drive image to a new USB flash drive. The asr workaround did not work either, returning Source volume format on device '/dev/disk3' is not valid for restoring. Could not validate source - error 254.

By happy chance, I stumbled onto Max's answer which credited drgeoff's reply, which linked to PureDarwin's Disk images page. The secret was to convert the image format to raw before writing with dd (attempting to restore even the converted image via Disk Utility returned the same 'Restore Failure' error above).

Here is the process I used to backup my DiskWarrior bootable USB flash drive and restore it to a new flash drive:

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Fix “could not validate source” error 254 in Mac Mac is the most popular used operating system known for providing better and reliable performance. The validation is identical to a real restore operation except that RMAN does not write output files. Note: If you use RESTORE with the VALIDATE option, then the database can be open with data files online. See Also: VALIDATE. Reports and validates—but does not restore—the backups that RMAN could use to restore to the specified time.

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Backup

Insert USB flash drive to be imaged
Open Disk Utility
Click root of USB flash drive
Click 'New Image'
Select desired Image Format (tested restore of 'read-only' and 'compressed (bzip2)' images successfully)
Save image to desired location

Restore

$ hdiutil convert /path/to/image_created_above.dmg -format UDTO -o new_image.img
Remove the .cdr extension that hdiutil automatically appended to new_image.img
Run Disk Arbitrator and set to 'Block Mounts'
Plug in new USB flash drive (WARNING: all contents will be erased) and note the assigned device name in Disk Arbitrator's Disks Window (e.g., diskx)
$ sudo dd if=/path/to/new_image.img of=/dev/rdiskx bs=8192
(Pipe through pv or use a dd alternative like dcfldd to easily track progress.)

In retrospect, it might've been better to avoid Disk Utility altogether and simply use dd to create the image:

$ sudo dd if=/dev/rdiskx | bzip2 -9f > usb_image.bz2

obviating the need to convert with hdiutil before restoring:

$ bzip2 -dc usb_image.bz2 | sudo dd of=/dev/rdiskx

UPDATE: It appears that dd/bzip2 creates a more faithful image than Disk Utility's compressed (bzip2) format does:

The image created using dd and bzip2 was 810.7MB vs. 626.6MB for the compressed (bzip2) image created by Disk Utility.
The MD5 checksum of the USB flash drive differed based on which image file was restored to it, so the difference in file sizes was not merely some difference in the compression algorithm (which should have been the same anyway).
When the dd-created image was restored and the USB flash drive plugged in, it mimicked the original DiskWarrior flash drive's behavior (only the /Volumes/DW Finder window automatically opened).
When the Disk Utility-created image was restored and the USB flash drive plugged in, Finder windows automatically opened for both /Volumes/DW and /Volumes/DiskWarrior Recovery (unlike the original DiskWarrior flash drive).

For Disk Utility to achieve similar results as dd/bzip2, one would need to select 'entire device' as the Image Format and then compress the image afterwards in Terminal: $ bzip2 -9f usb_image.dmg > compressed_usb_image.bz2. And, before restoring the image, it would need to first be converted with hdiutil as shown above. Back to dd for imaging disks!

/mac | Mar 19, 2015

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Fix 'Could not validate source' error when trying to burn ISO file to USB stick.

1. Issue

I was trying to burn an ISO image file to my USB stick by Mac OS Disk Utility. But Disk Utility failed to burn and give me an error: 'Restore Failure Could not validate source - invalid Argument'.

After googling the issue, I found that the error is caused by incompatible image file formats. Disk Utility expects Apple Disk Image, including the Universal Disk Image Format (UDIF) and the New Disk Image Format (NDIF), while the format of ISO image file is ISO9660.

Following is a list of Apple disk image formats, according to man page of hdiutil command:

Firstly I attempted to convert the ISO file to a UDRW image file, a kind of UDIF format.

Cached

The result of above line is a dest.img.dmg file. Quicktime pro 7 mac serial key. (My Mac OS X appends .dmg ending to the output file automatically.)

Then I tried to burn the .img file using Disk Utility, but the burning still failed with 'Could not validate source' error.

Restore Dmg Could Not Validate Source Codes

2. Solution

'Restore Failure - Tinyapps

The solution is using Linux dd command instead of Disk Utility GUI.

Checking the mounted point of USB stick:

The output was something like this:

I assume that the device node of USB stick is: /dev/disk2.

See Full List On Macfixz.com

Unmount it before burning, otherwise dd command will complain the stick is busy.

Then burn the image file to USB stick using dd:

Unmount the USB stick after finishing: