Making an ISO image is a common way of backing up a hard drive or making a duplicate version of a complex set of folders and subfiles. Once saved as a single ISO, many files become one large file, which is much easier to transfer and simple to reopen at the other end. ISO images are also useful for duplicating disks. Some ISO files, especially backups, get quite large and may exceed the capacity of a DVD. In this case, it is possible to split the file into pieces with free software that will also knit the pieces back together at the other end.
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Things you need
- 2 blank DVDs
- HJ-Split software
Download HJ-Split from Freebyte. It is a free open-source software package with versions available for all major operating systems.
Double click on the ".exe" file when the download completes. This will open HJ-Split.
Click on "Split" in the main screen. In the dialogue box that pops up, select the 9-GB ISO image you would like to split and choose the size of the resulting files. Since you are burning to DVDs, which have a capacity of 4.7 GB, split the file into 2 pieces of 4.5 GB each.
Select a location for the split files and name them. Click "Split."
Insert a blank DVD-R into your DVD-R drive.
Click and drag the first portion of the split file onto the DVD's icon, and click "Write these files to DVD."
Eject the DVD when the burn is complete, and repeat the process with a second DVD for the second portion.
Rejoin the files later or on another computer. To do this, insert the first DVD and copy the first portion of the ISO to the hard drive of the computer. Eject that DVD and insert the second disk. Copy the second portion of the file to the same location as the first, and then open HJ-Split and click "Join." Select the two files and click "Join." Your file will be reassembled and can be opened again.
Tips and warnings
- You will not be able to reliably open an ISO that has been split into portions until you rejoin the portions. If you need to do this, open the ISO and divide the contents into two separate 4.5-GB portions, and then create new ISO images.
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