Complete Disk Imaging
This type of backup is getting more and more popular now days and most preferred by such organizations which have very sensitive data in their systems. They people can not take any chance of even a single percent of data loss.
Such organizations take their backups as entire disk image regularly. Though it is some time taking but gives you surety that you will miss nothing. Due to its increasing popularity, programmers have tried their best to make the disk imaging software more and more faster to minimize the time period taken by the imaging process.
Disk imaging is a good Idea because just by spending some tens of minutes you can get the ease of mind that you have backup of everything in your pocket. All of the factors like MBR, BDR, FATs, Root Directories are copied to the destination disk as it is.
What we need for disk imaging is an Identical (or almost Identical) destination hard disk, to our source hard disk in which we have our valuable data. One thing is always kept in mind that the destination disk should not be smaller then the source disk.
After taking the complete image, if you boot the system with the destination disk, in which you have taken the disk image, generally you will get all the data as it is.
Writing the program for complete disk imaging
The program for disk imaging has been given next. The Program uses the INT 13H extensions therefore it can support large disks too.
The program makes the image of first physical hard disk drive (0x80) to the second physical hard disk drive (0x81) therefore before making the backup image you should keep it in mind that all the data in destination disk (0x81) will be overwritten by the data of source disk (0x80) in sector by sector pattern.
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