WD4004FZWX (128MB) vs. WD4005FZBX (256MB)

WD Internal Drives Desktop & Mobile Drives
1

Hi,

I recently purchased the WD Black (WD4004FZWX), but found that there was another model available with more cache (WD4005FZBX). I wanted to ask if there is a big difference between these two hard drives? From the performance e.g.? I don’t want to send it back and order a new one.

I’d be grateful for an answer.!