Formatting does not always mean that all previous data has been permanently erased.
A quick format generally recreates essential file system structures without necessarily overwriting every sector that previously contained user data. Recovery may therefore be possible in some cases.
A full format, secure erase, or other sanitization procedure can have a different effect, depending on the operating system, storage device, and method used.
For this reason, the word “formatted” alone cannot establish whether recovery is possible.
Before attempting recovery, it is important to determine what kind of formatting operation occurred and whether additional data was written afterward.
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- Why SSD Data Recovery Is Different from HDD Data Recovery
Solid-state drives (SSDs) use NAND flash memory and an internal controller to manage logical addresses, physical flash locations, wear leveling, and garbage collection.
Traditional magnetic HDDs and SSDs therefore behave differently when files are deleted.
On a compatible SSD, the operating system may issue a TRIM command to notify the device that certain logical blocks are no longer needed.
The SSD controller may subsequently reclaim the associated flash-memory blocks through garbage collection. Depending on the device and its internal operations, deleted data may become unrecoverable even if the user has not deliberately saved a new file over the same logical location.
However, TRIM being issued does not automatically prove that every deleted file has already been physically erased. The outcome depends on the SSD, controller, firmware, operating system, and subsequent activity.
This is why SSD recovery requires a different technical assessment from traditional HDD recovery.
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