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As BR pointed out: presence of metadata.db is the defining aspect of a Calibre Library. Not the name.
The containing folder is the Library NAME. It can be almost anything ALL the file systems consider a legal name
If Calibre starts and can not FIND the current (last used) library, it pops a warning and will create a default, named 'Calibre Library'
You mention 2 OS... Dual Boot??
Calibre is NOT NAS/Cloud safe. Local drive only.
Do read the FAQ at calibre-ebook.com (where you get Calibre)
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