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How to Make a Sparse Image
Here's the executive summary in case the link over at TheMacMind goes away. You can use the unix utility One such option is to create a disk image (possibly an encrypted disk image) that is sparse; i.e., the image file is only as large as it needs to be. (However, the image file never shrinks in size once it has expanded.) For example, suppose you are keeping all your work, mail, etc. on an encrypted disk image. You occasionally eject the image volume and burn the image file to CD-R for backup. With a sparse image, the burning may be much faster because empty space in the volume will not be backed up. To create an encrypted, sparse disk image, open a Terminal
window and cd ~/Desktop Then type the command: hdiutil create -size thesize -encryption -type SPARSE -fs HFS+ thename Above, You will be asked for a password or phase to secure your file. At that time, you should probably uncheck "Remember password (add to Keychain)" because your passphrase will be visible in the Keychain to anyone with physical access to your computer. The file You can also use the hdiutil imageinfo theimage.extwhere theimage.ext is the name of the image
file, for example, myimage.dmg or
myimage.sparseimage or whatever.
There is a manual page available; type
How to Make a Sparse Image
>you should probably uncheck "Remember password (add to Keychain)" because your passphrase will be visible in the Keychain to anyone with physical access to your computer.
How to Make a Sparse Image
Ok so I never get prompted for a password. The only way this works for me is to put the passphrase on the command line, not very secure especially when mounting. |
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