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- Virus infected the file system and get it damaged that Windows or your pc can no longer recognize its old file system.
- There are several possible causes that your disk may become raw format. When it happened to a hard drive, it means the hard drive is damaged with an unrecognized file system. Raw file system asked formatting Why removable disk became raw file system? How did it become raw file system? Is there any method to convert the raw external disk to ntfs without losing data? This morning when I took it with me to my office, it warned a reformat window when I get it connected to Windows 10. The external drive was bought 2 years ago and was used for 2 times only for work files and folders. My wd external usb disk 1TB suddenly turned to raw and asked for a formatting.