@nick - Sadly it won’t play nice in your SATA II (3.0 Gb/s) system as its a fixed SATA III (6.0 Gb/s). You’ll need to find an older drive (Fixed) or get one of the Auto Sense drives.
Full spec sheet for your drive [https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/sandisk/product/internal-drives/ssd-plus-sata-iii-ssd/data-sheet-ssd-plus-sata-iii-ssd.pdf|SanDisk SSD Plus]