Upgrade Mac OS 17.0, Lost my hard drive in Windows

Before upgrade Mac OS, I had three hard drives C:, H and G. Drive H is for Mac operation system. C and G are NTFS for windwos operation system.
After upgrade Mac OS, I lost G Hard drive, only have C hard drive in the Windows operation system. The G Hard drive had some data files. I don't understand why ater upgrade Mac operation system I lost G Hard drive in Windows Operation system.
Please help, how to recover G Hard drive in Windows operation system. Thanks,

Used the USB Install 10.7 from Apple/

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