• Osstatus Error 1 Disk Utility
• Disk Utility Could Not Validate Source - Invalid Argument
• Could Not Validate Source 254

It turns out that Disk Utility employs Apple’s ASR utility, stored at /usr/sbin/asr. To learn more you can run ‘asr’ by itself in Terminal. Shows a lot more, I’ll save you from reading that (this man page has even got a History section). Simply restore without an image scan: $ sudo asr -noverify -source source-target target. Disk Utility was unable to create the disk image, so I proceeded to the next option. Copy via a network connection I thought perhaps the user directory could simply be copied over, bypassing the. Could not validate source – corrupt image, it is one of the most critical error issue which is often encountered when Disk Utility is corrupted on Mac. Disk Utility is one of the most amazing feature of Mac machine which is used to repair all kind disk corruption issue on Mac. Launch Disk Utility, select the image, and scan for restore. Too late, but you should have verified you could do the restore before wiping the HD. In the future, I suggest making a bootable backup/clone and verifying it before deleting the original, then restoration is simply restoring the backup/clone. 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.

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

1. Issue

Osstatus Error 1 Disk Utility

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:

Disk Utility Could Not Validate Source - Invalid Argument

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

The result of above line is a dest.img.dmg file. (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.

2. Solution

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.

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:

Could Not Validate Source 254