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My name is*****'m a certified computer professional with 15 years of experience. It would be my pleasure to assist you with this. It is possible to recover the files but you will need to use specialized software to do so.
Basics of File Recovery
You must not allow any additional writes to the hard drive - shut it down. When files are deleted only the directory entries, not the files themselves, are modified. The space occupied by the files has been returned to the system as available for storage, but the files are still on the drive. Writing to the drive will then eventually overwrite the space once occupied by the deleted files in which case the files are lost permanently. Also if you save a file over an existing file of the same name, then the old file is overwritten and cannot be recovered.
If you stop using the drive it's possible to recover deleted files that have not been overwritten by using recovery software such as Data Rescue II, File Salvage or TechTool Pro. Each of the preceding come on bootable CDs to enable usage without risk of writing more data to the hard drive. Two free alternatives are Disk Drill and TestDisk. Look for them and demos a tMacUpdate or CNET Downloads.
The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten.
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Closed the computer at the moment of discovering risk. NOT shut down yet. Can I download any of the above products and create a bootable CD on another computer?
Yes, you can. That would be the ideal solution, because going online to purchase, and download and burn to cd on the Mac that you've lost files on may overwrite the lost files, making them unrecoverable.You can click here to read a detailed comparison of 3 products that will meet your needs, in addition th those already mentioned. I believe that all of them offer a downloadable option.