How to retrieve deleted files from emptied bin on iMac

Obvious first step: restore from a back up?

If not: stop using your computer. The more you use it the greater the risk of the deleted files being overwritten and made unrecoverable.

You'll need to download a file recovery app. There are lots. Mostly they'll scan the drive and tell you what is recoverable, but actual recovery will mean a purchase.

There is no hope of recovering deleted data from an SSD drive.

On an SSD drive, the drive controller will TRIM the deleted data, group the freed blocks into SuperBlocks, discarding their block numbers, and erase those SuperBlocks to be ready for new data. All in less than a second.

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On a Rotating Magnetic Drive, block numbers are fixed, and the deleted data are not written over. Only the directory is changed, and the block numbers are added to the FreeList for later re-use. In this case a data recovery tool MIGHT be helpful. But the more you write to the drive, the more likely some portion of your data blocks will be re-used for new data.

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