I have a failed windows 10 1tb SSHD which I had to use windows dskmgt to allocate a letter and set as active drive data is raw. Recuva requires the disk to be formatted but says data will be lost. What do I do?
If you didn't format the drive it's possible to convert the RAW back to NTFS without losing any data. You can do it via a Command Prompt, or you'd need a third-party partitioning tool to do it though, although with the freeware version of such tools I don't know if they'll allow you to do that. There's an article on it here from EaseUs, although they're also adverting/pushing their partitioning software in that article.
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