I'm asking on behalf of a friend who got a wierd problem.
His system have 3 partitions, 2 of which (drive D and E) are dedicated to data. About 2 months ago, he did a full reinstall of his XP system and upgrade to 7. After sometime, for whatever reason, he downgraded his system back to XP. On that system, he did some work and added 50gb+ data to the data partition.
Today, he reformatted the C drive and install 7 again. The funny thing is, the 50gb+ data he added when on XP now missing. All other data is intact. In fact, the state of the 2 data partition is like when he last use 7 before downgrading to XP.
Just to be clear, all his data partition is intact after today's 7 install, only those data (contained on several folders) he added when on XP is missing.
What happened? Can we get those data back? How?