I use ImTOO DVD Ripper rip my DVD to hard drive with fast speed and perfect quality. And it can convert VOB file to AVI easily. I recommend you to rip your DVD to your hard drive with it. I would like to share happy with you. Introduction of ImTOO DVD Ripper
ImTOO DVD Ripper can copy your favorite DVD movies to almost any popular video format such as VCD, SVCD, WMV,ASF,WMA, DivX, MPEG1, MPEG2, MPEG4, Xvid and AVI etc.
Features:
1, It is suited for both veterans and beginners - If you are a veteran, you will find there are so many options you can set, if it's the first time you copy DVD movie, you don't have to consider these options, just use default settings and rip DVD to hard drive in a few clicks.
2, It automatically checks your CPU type - It can check your CPU type automatically, use your CPU fully that ensure you can copy your DVD and convert VOB file to AVI with the best ripping speed.
3, It supports preview - You can preview the movies before you begin ripping them to hard drive, you even can watch the movies at the same time when you are ripping DVD and converting VOB to AVI.
4, You can select chapters to copy at will - You can copy entire movie or just one or several chapters, or copy any segment of the movie.
5,It supports batch conversion - You can select all files you want to copy and the software will automatically copy them and convert VOB to MPEG one by one.
6, It offers excellent image and sound quality - Using this VOB to AVI converter you will get the movie formats you want with excellent image and sound quality.
7, You can use it to auto-split output file into several files to fit CD-R.
8,You can select target subtitle and audio track.
Step-by-step Guide: How to rip DVD to hard drive and convert VOB file to AVI? Step 1: Free download ImTOO DVD Ripper and save it in your computer, and then run it. Step 2: Launch ImTOO DVD Ripper and the clear interface is as follows: 
According to the "Getting Started" in the center of this clear and easy-to-use interface, you can easily use it to rip DVD to hard drive and convert VOB file to AVI by 3 steps:
Click "Profile" combo-box to choose a profile
Click "DVD" button to open DVD
Click "Rip" button to start ripping
Step 3: Insert your DVD disc to be ripped to hard drive into DVD drive and click "Profile" combo-box to choose a profile of "DivX Movie(*.avi)" 
Step 4: Click "DVD" button to open DVD 
And then the files to be ripped will be displayed in middle blank area
Step 5: Click "Browse" botton to select an output path 
Step 6: Click "Rip" button to start ripping DVD to hard drive 
That's OK. You complete successfully to rip DVD to hard drive and convert VOB file to AVI.
Tip:
1, It supports preview - You can preview the movies before you begin ripping them to hard drive, you even can watch the movies at the same time when you are ripping DVD and converting VOB to AVI.
2, You can select chapters to copy at will - You can copy entire movie or just one or several chapters, or copy any segment of the movie.
3, It supports batch conversion - You can select all files you want to copy and the software will automatically copy them and convert VOB to MPEG one by one.
If you are a veteran, you will find there are so many options you can set, if it's the first time you copy DVD movie, you don't have to consider these options, just use default settings and rip DVD to hard drive in a few clicks.
In one word, it is easy to use, fast in speed, excellent in quality and reasonable in price.
I hope that this dvd ripper and guide will be helpful for you.
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