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You can use software to recover this data if you get to it before it's overwritten.
Never mind 'where does information go after it has been deleted', I would like to know where the hell it goes before in some cases!!!
...The master file is kept in RAM, and only written back onto the drive when time is available. Also the files themselves are not written back to the drive instantly. That's why when you get a hard shutdown, you can get into trouble. The stuff in RAM that was supposed to be written back to the drive is lost. Then the master file on the drive might have the wrong numbers for the locations of the data on the drive.I think it works that way 
Enabling or Disabling the Disk Write Caching 1. Right-click My Computer, and then click Properties. 2. Click the Hardware tab. 3. Click Device Manager. 4. Click the plus sign (+) next to the Disk Drives branch to expand it. 5. Right-click the drive on which you want to enable or disable disk write caching, and then click Properties. 6. Click the Disk Properties tab. 7. Click to select or clear the Write Cache Enabled check box as appropriate. 8. Click OK.
So say someone wants to keep their information to themselves and very private... but wishes to put info on anther computer and give old computer away like was suggested ..or sell it...... can the info be deleted to the point to where the most skilled computer analysts could not retrieve info...and still be left witha fully functional Harddrive?What if you wiped the hard drive? Would the info still be there ling in wait for a specialist to hook it up to somethging and retrieve all your personal info even though you wiped the hard drive?