If the drive has become the RAW file system, you should first check the drive size to see if it is exactly 128 or 137 GB. The raw filesystem issue may be caused by the clipped hard drive capacity.

If you see 137 or 128 GB, you need to check whether the BigLBA still works before you rush to recover data. This is especially true for the drives (including external USB drives) which were brought to an old computer.

The BigLBA is a registry parameter which determines whether to use 48bit block addressing or not. If it is disabled then the maximum accessible disk size equals to 128 or 137 GB (depending on what units are used for the drive size, binary or decimal gigabytes).

Sometimes it turns out that the BigLBA is off despite the fact that theoretically it should be enabled in any modern installation (starting with Windows XP SP2).

Refer to the instructions for troubleshooting disk capacity issues for more details on what you need to check and how to enable the BigLBA parameter. If in fact BigLBA was an issue, then fixing it typically restores the drive with RAW filesystem to proper functioing.


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