Volevo sapere come mai sul disco Macintosh, ce scritto HD e non SSD?

Automated translation ("Italian detected"): "I bought mac Studio M2. I wanted to know why on the Macintosh disk, there is written HD and not SSD?"

Apple never bothered to change the name. Despite the outdated (confusing) name, your Mac Studio does have an internal SSD. (Actually, raw flash modules managed by a SSD controller built into the M2 { Max / Ultra } chip.) There's no room inside a Mac Studio for a HDD even if Apple wanted to put one there, and "Macintosh HD" is not an indication that Apple accidentally shipped you a computer with an old-fashioned mechanical HDD.

On my old version of macOS, you can rename a startup drive just about anything you wish. If you didn't care for "Macintosh HD", you could simply change it to "Macintosh SSD". Some applications that had stored file names might be confused, but many would not be.

I don't know how well renaming works on recent versions of macOS, where a startup volume actually consists of two sub-volumes – a hidden, sealed, read-only system volume, and a user data volume. Maybe if anybody else here with a newer Mac has renamed startup drives, they could chip in.

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Works fine at least up to Ventura on Intel any way.