OK to remove any old dmg from Downloads folder to increase disc space?

This is related to my earlier question about the 10.6.6. updater combo dmg. I just don't understand dmgs. If they are in my Downloads folder and not current, can I assume I don't need them any more? That is, am I likely to have problems if I delete them?

Hi
A dmg is a "disk image" - a way of converting a collection of files and folders into a serial sequence of bytes that can be conveniently downloaded. When you "mount" a disk image, OS X gets access to the files.
Frequently, a disk image will contain an installer application. When you run this, it copies all the necessary files to their various locations on the disk so that the software is installed or updated.
In principle, one could download an installer directly from the net without the need for a disk image, however Apple and other distributors tend not to do this, because the disk image allows the addition of other files, such as a Read Me, Release Notes or User Manual.
Once the installer has been run, then the software on the disk image has been installed so in theory you don't need the disk image file any more - however, you may decide you want to keep it anyway because it's got (say) the User Manual or useful Release Notes.
Bob

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To free disc space I've been removing old files. MacOSXUpdCombo10.6.6.dmg is by far the largest, at 1 GB. I seem to recall using this file when I had to revert back to 10.6.6 after having font problems with 10.6.7. I believe it's OK to just remove it to a backup source, but want to check before doing that, just in case. Thanks for your council and any enlightenment on the function of such update dmgs, once they've been used.

IMHO you have a more serious problem here. If 1 GB is going to make a difference in the amount of free space you can notice then your disk is probably too full and you should be looking for more drastic solutions to gain free space such as deleting your files.
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OK to remove any old dmg from Downloads folder to increase disc space?

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