free space is obvious and many OSes (including modern windows) will have data during an observed period as well as instantaneous rates. Many SSDs will have it as part of standard SMART logs (233 Media Wearout Indicator being the main option), it might exist on some higher end big boy hard drives if they have a warranty sold on so many complete writes/total data written, it might also be an option of high end NAS units, SANs and possibly big boy RAID as well. Whether it exists for consumer grade spinning rust I do not know at this point.