Question regarding HDD failure VIA Crystal Disk

Subsequent to receiving the usual Windows HDD failure notification, I used CrystalDisk to verify it. (Image attached).

My question is, what do my particular stats mean? I noticed the Reallocated Sectors Count is red, and the Current Pending Sector Count and the Uncorrectable Sector Count are yellow.

Does this mean that I have ALREADY lost data? Or could it be possible that some data has already been damaged? Does this mean that some of my dada was probably lost over time?

I usually backup my data once a week, but I haven't backed it up in a month. That said, as soon as I received the windows error, I backed up all of my data immediately.

Do you think my data was affected in any way?

Do you think you can answer this using an example? I only ask because the only data I'm concerned about are my music files and I have 150 Gigs of music. I couldn't imagine playing nearly 20,000 music tracks one by one to search for any fine signs of data corruption. That would make me . I mean, as soon as I seen the warning, I successfully did an image backup of my data using Shadow Protect.