jj juice, if you give or sell me your old computer, with a formatted drive and re-installed OS, I can recover almost all your old data with any of the many giveaways we have seen here. Or with the free Recuva.

Formatted does NOT wipe the original data. It only 'tells' your computer it can overwrite all existing data.

gergn  –  6 years ago  –  このコメントは役に立ちましたか？ はい | いいえ (+34)

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little ricky, When files are deleted from your computer/disk formatted, you are simply deleting the directory listing for the particular file. Even thou it is no longer "visible", the data remains on the disk and isn't permanently removed until it's overwritten with new data. Just re-installing an OS only over writes the area previously used by the OS. Other data remains. The only real way to actually wipe a drive so nothing can be recovered is a complete overwrite of the complete drive, usually consisting of all zeros, except the 511th and 512th byte..those are left with the code that allows the BIOS of an MBR system to recognize the drive is ok to write to. Or take a hammer and nail to it and completely destroy the platters inside.
UEFI and GPT systems are a bit more difficult, but again, unless the complete drive is over written, old data that isn't part of the O/S could be recovered with advanced methods. I had an old drive here that I did a complete format on, but decided to check it

DJ  –  6 years ago  –  このコメントは役に立ちましたか？ はい | いいえ (+14)

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little ricky, you might de amazed.

Many formats, like .pdf and .doc have a characteristic header that can be found. And from there ...

I remember long, long ago I used to replace the two bytes in the header of an encrypted WordPerfect file to make unwanted de-encryption more difficult.

gergn  –  6 years ago  –  このコメントは役に立ちましたか？ はい | いいえ (+12)

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