A 500GB External HDD Went Unallocated but TestDisk Found 2TB Partitions
TL;DR:
Never apply partition proposals to an unallocated drive if they exceed the physical media capacity, such as TestDisk suggesting 2TB partitions on a 500GB external HDD, because these implausible results indicate damaged metadata, false scans, or developing hardware problems rather than a valid restoration path.
● Avoid initializing, formatting, or running CHKDSK repair options directly against the source drive to restore a drive letter, even if original files are visible in tools like DiskGenius.
● Stop repeated free scans and seek professional imaging if the disk becomes unstable or reports read errors and abnormal SMART health signals.
● Use an error-aware process like GNU ddrescue to make a sector-level copy to a verified destination if hardware access remains stable, performing any free extraction or partition table repair strictly on this disposable clone.
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If a 500GB drive suddenly appears unallocated and a partition utility proposes a 2TB partition, do not write that proposal to the disk. A proposed partition larger than the physical media is not a trustworthy restoration plan.
In this r/datarecovery 500GB external-drive case, a user could view files with DiskGenius but could not afford paid export. TestDisk then suggested impossible sizes; follow-up discussion also raised concerns about SMART health.
File Visibility Does Not Make In-Place Partition Repair Safe
First confirm that Disk Management detects the correct full physical capacity. Unallocated describes the current partition map, not necessarily that the original file contents are gone. However, implausible partitions and abnormal read-health signals can indicate damaged metadata, false scan results, or a developing hardware problem.
Do not initialize, format, apply TestDisk writes, or run CHKDSK repair options against the source just to restore a drive letter.
Protect the Copy Before Trying Free Extraction
If the disk is unstable or reports read errors, stop repeated free scans and seek professional imaging if the files matter. If hardware access remains stable and the risk is acceptable, make a sector-level copy using a verified destination and an error-aware imaging process such as GNU ddrescue.
Inspect the image for original files, export priority data to separate storage using an appropriate free tool where possible, and verify exported files. Only after preserving the data should any partition-table repair on a disposable copy be considered.