If you run System 7 on your mac and use multiple hard drives or multiple hard drive partitions, you’ve probably run across this alert when you try to unmount one of those icons:
If you’re annoyed by this alert, you can turn it off using ResEdit with the following procedure:
1) Open a COPY of the Finder (ResEdit won’t open the Finder currently in use.)
For Systems 7.0 and 7.0.1…
2) Open “CODE” ID=18. If it asks something about compression, just click OK.
3) Go to offset +$13B2.
4) Change the two words there
FROM $4EAD $1D42
TO $4E71 $4E71
Do NOT make this change if the two words are not $4EAD $1D42.
For System 7.1…
2) Open “CODE” ID=17. If it asks something about compression, just click OK.
3) Go to offset +$15E6.
4) Change the two words there
FROM $4EAD $1E42
TO $4E71 $4E71
Do NOT make this change if the two words are not $4EAD $1E42.
**7.1 BETA NOTE: The given information is for the System 7.1 final. In 7.1b7, the hack will still work, and the two words are in the same location, but note that they are $4EAD $1E32 instead. I don’t have any information on earlier 7.1 betas.
5) Save your changes and replace the current Finder with your hacked Finder.
6) Restart. The alert should now be history.
This hack has been tested under Finders 7.0, 7.0.1 and 7.1. It DOES NOT WORK on prior versions of the Finder and is NOT guaranteed to work on future versions.
As with all such quick hacks, use at your own risk.