Ok so yesterday i wanted to try out windows 7 beta build, in order to do so without having to format my C partition i made a backup of C using Acronis True Image Home 11.0. Installed windows 7, tried it out, got borred, and recovered the C partition using True Image. Problem: i had my hdd partitioned in 4:C,D,E,F ...and now my E,F partitions are gone. And they were the most important E being data storage and F for backups. Got any ideea why this happened? i think it started happening from windows 7 because My computer got stuck every time.

First off Beta builds are somewhat risky. That being the case you shouldn't use your everyday system for testing. Look in Disk Management to see if the other partitions are visible there. You should also have backups of all personal data.

I have same problem but I went conputer management > disk management I brought the partion as new how can get data back because asking me to format. Thanks.

Dotuletz the mistake was not doing an image of the drive which would have included those missing partitions. I would suspect Win7 ntfs is different then xp's just like NT's ntfs was different from W2K's. I would reinstall Win7 and then see if you can access the partitions. If you can you want to copy off the data then restore your first image to get back to xp. RUBAN you should never have made a new partition with space containing data. Your only hope now is a data recovery software. Example of Oxymoron: Person who is pro life and anti sex education. Education is key to prevention. Prevent conception you prevent abortion. Abstinence training clearly isn't working.

I'd suggest next time using Virtual PC rather than installing the OS on your boot partition. Lesson learned... "So won’t you give this man his wings What a shame To have to beg you to see We’re not all the same What a shame" - Shinedown

@jeniffer Not quite. using virtual machines is good but i wanted to test out fully the new os.so lesson not learned. @wonderer I dont't have unlimited space to make backup of every data on my pc. I used paragon partition manager and succesfully restored one of my partitions (that is the 100Gb one) wich included most of my data. The other partition contains only backups and software installation files (and some private data but it ain't really necesary). Having the 100Gb partition back is a dream so i`ve decided to format my machine and reinstall everything...then make a fresh backup of C drive with no problems. THANKS A LOT FOR YOUR HELP and even if i got thru myself maybe somebody will make good use of this responses

Dotuletz Hard drives are cheap and DVDR are even cheaper. There is no good excuse not to backup your personal data. I have three partitions on my primary drive and image each partition separately. My Boot partition fits on 2 DVDR single layer. I pay 15/20 cents for DVDR on sale. Pretty cheap insurance.