I have 2 white macbooks to erase them, HOW please

Because M2 must have a different version of OS X that the M1 disk installs. Typically, that would be interpreted to mean the OS X on the M1 disk is an earlier version than required by M2.

Five ways to eject a stuck CD or DVD from the optical drive

Ejecting the stuck disc can usually be done in one of the following ways:

1. Restart the computer and after the chime press and hold down the

left mouse button until the disc ejects.

2. Press the Eject button on your keyboard.

3. Click on the Eject button in the menubar.

4. Press COMMAND-E.

5. If none of the above work try this: Open the Terminal application in

your Utilities folder. At the prompt enter or paste the following:

/usr/bin/drutil eject

If this fails then try this:

Boot the computer into Single-user Mode. At the prompt enter the same command as used above. To restart the computer enter "reboot" at the prompt without quotes.

if the disc you are trying to use on M2 is the install disc that M1 came with, that is why you're getting the error message you are.

when a mac ships w/ install discs they are specific to the machine they came with unless you buy a multilicense use of that OS software disc.

you will need to locate a disc that contains the original OS that both macs came w/ and use it to erase them and reinstall the OS.

also another way to try and eject a disc from the drive is to shutdown the mac and then restart it holding down on the eject key on the keyboard that usually will make it come right out. 🙂