Disk image size

Hello. I have a number of files on an external drive that I would like to save to an encrypted image. The files amount to over 300 gb(and will grow). The external HD is 500gb. Is there a limit to the size of dmg file? Is there a better way to lock/encrypt the external HD rather than using a dmg file? Thanks in advance for your help.
Greg

Thanks for quick response! It looks like the "sparse disk image" format is the way to go. One other question: do I need to have space on my external HD to create various sparse disk image(s)? example: external HD free space is 75gb(out of 500gb)The files I want to put into the dmg file is on the external HD(425gb). Do I need to move the files to another HD, create the sparse image(s) and move back the files? Also, when adding files to the sparse disk image will I be alerted when I reach my limit or when there is no space to expand to my set size? Thanks again.
Greg
There's no limit to the size of a disk image - at
least, whatever limit there is is way higher than
500GB. If you look in Disk Utility -> New Image
there's a popup menu where you can specify the image
size and it includes a 'TB' option, so you can scale
into the terabyte range.
Using disk images is one of the easiest ways to
encrypt data, so that's a good start.
In addition you can create the image as a 'sparse'
image. This means that you can create a 500GB image,
but it will only consume the actual amount of disk
space required by the files it contains. This
contrasts with a typical disk image which would
consume 500GB of space even if 499GB of that was
empty.

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Message was edited by: James Kilgore
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