Computer hard drive used more for business than personal, is it an expense (supply) or asset

Good day. I bought a $300 external desktop hard drive to use for my business. I use it 70% of the time to store large files from my video work, but I do have a few personal files on it. Should I deduct this as a Business Expense (Supplies) or as a Business Asset?

 

Whenever I buy flash drives or hard drives that I use for business purposes 100% of the time, I've always entered them as a Business Expense (Supplies). But this hard drive I bought and use stores mostly files for my business (about 70% of the space), and I also store some personal files on it. It's an external desktop hard drive, so it just sits on my desk and does not move.

Thank you.