Mac OS X: "The disc ‘Ram‘ could not be modified" Alert

You may be using an improper DVD-RAM disc caddy or have a disc in the UDF format if you see an alert box with this message: "The disc 'Ram' could not be modified."
This article has been archived and is no longer updated by Apple.
Symptom

When copying files to a DVD-RAM disc in UDF format, an alert box appears with this message: "The disc "Ram" could not be modified." You can still read from the disc and copy files from the disc to another volume.


Solution

First, be sure that you are using the DVD-RAM disc caddy provided with the computer. You cannot write to the disc unless it is in the caddy. Next, check the format of the disc. Select the disc in the Finder then choose Show Info from the File menu. The Info window displays the disc format under General Information. Mac OS X writes to DVD-RAM discs formatted in the Mac OS Standard (HFS), Mac OS Extended (HFS Plus), or Unix File System (UFS). If your disc is in the UDF format, you can back up the data on the disc and reformat it to gain the ability to write to the disc. After backing up the data, you can follow these steps:

Warning: This process will erase all data on the DVD-RAM disc. If you decide to format the disc as UFS, the disc will not be available to Mac OS 8 or Mac OS 9.
    1. Insert the DVD-RAM disc into the DVD-RAM drive, being sure to use the DVD-RAM disc caddy provided with the computer.
    2. Open Disk Utility (/Applications/Utilities/).
    3. Click the disclosure triangle next to the DVD-RAM drive and select the DVD-RAM disc below it.
    4. Click the Erase tab.
    5. Choose Mac OS Standard, Mac OS Extended, or Unix File System from Volume Format pop-up menu.
    6. Click Erase.
Published Date: Oct 7, 2016