You can image it with Disk Copy 6.3.3. Make the image read/write and uncompressed. In order to do this you'll need to boot from a floppy or CD as you can't completely image a running system. You'll also need a destination for the image. In my case, I save it to a network folder via Appleshare.
Depending on the size of the hard disk you may need one of the later Disk Copy betas (like 6.5) as 6.3.3 has a disk size limit of 2GB. Later versions can image larger disks by splitting the output image into 2GB segments (which you can later join into one image if you prefer).
If you don't want to image all the free space just opt to create an image from a folder and choose the hard disk root. When it calculates how big the image will be, you can add on whatever extra free space you'd like.
Depending on the size of the hard disk you may need one of the later Disk Copy betas (like 6.5) as 6.3.3 has a disk size limit of 2GB. Later versions can image larger disks by splitting the output image into 2GB segments (which you can later join into one image if you prefer).
If you don't want to image all the free space just opt to create an image from a folder and choose the hard disk root. When it calculates how big the image will be, you can add on whatever extra free space you'd like.