Plextor PX-R820Ti Taiyo Yuden 8x CD-R 19-disc set

Purchased used around 2008.
Approximately 50-60 discs were burned after purchase.
Non-smoking environment.

The last time it was used was in 2014, and it worked without any issues at that time.

Currently unable to test functionality as I do not have a SCSI environment.
Power-on and recognition of blank media have been confirmed.

Firmware version is TLA 0503.

The CD-Rs were also acquired from Yahoo Auctions around the same time.
They are Taiyo Yuden PM lot, 4-digit serial number (PM7490).
There are 19 discs remaining.
Stored in a dark place, but as these are old items, the manufacturing quality cannot be guaranteed.