DVD Copy for Windows 
Copy high quality DVD movies and DVD folder to DVD disc.
Free TrialBuy NowAfter knowing about the benefits, now the point is how to compress a 7.9G DVD9 movies to a 4.3G capacity DVD5 disc? What you need is a DVD backup tool with D9 to D5 compressing function. Aimersoft DVD Backup for Mac is such a D9 to D5 compression tool while providing high quality DVD backing up. The following steps will tell you the detailed operations:
After you download Mac DVD9 to DVD5 Backup (Snow Leopard, Lion included), install and launch it.
Insert the target DVD9 movie disc after finished the launch. Just Choose "Backup to DVD" as your output mode, and then it will appear the copy interface.
Select the D9 to D5 compression item and set your preferred copy mode like "Main Movie Copy" or "Full Copy" before starting as the output option, you can choice the copy speed by yourself.
The newly upgraded Mac DVD Backup adds the new function to "Split Copy", which can split DVD9 Movies to two DVD5 Discs, you can save your DVD Movies with little money.

Tap the "Start" button to begin to copy your DVD9 movie to DVD5 disc on iMac. Of course, you can preview the movie before the copying.

The D9 to D5 copy will be completed in few minutes, and then you can share your copies with your friends or just keep it for collection. It's all up to you.
Note: Windows users please download DVD Copy for Windows to compress D9 to D5 in Windows.
D9 holds around 8 540 000 000 bytes and that is 7.95 computer GB. DVD+R support this format. This media is called DVD+R9, DVD+R DL or 8.5 GB Media. A DVD-9 (dual layer) disc and hold 240 minutes of continuous video.
D5 holds around 4 700 000 000 bytes and that is 4.37 computer GB where 1 kbyte is 1024 bytes*. DVD+R/DVD+RW and DVD-R/DVD-RW support this format. This is the most common DVD Media, often called 4.7 GB Media.
Compared with DVD9, DVD5 has the following advantages that DVD9 cannot reach:
If you want to make more copies of your favorite DVD movies, you'd better choose DVD5 disc to backup, it will save a lot of money.
If you want to rewrite your DVD disc, you should choose DVD5 disc, which allows you reuse to backup different movies or data.
Copy Protected DVDDVD+R to DVD-RCopy main feature movieBackup DVD movie
Backup DVD movies to DVD folder, ISO file or .dvdmedia with D9 to D5.
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