Exact model
Crucial part numbers are useful because similar looking M.2 products may belong to different generations.
Capacity
Common capacities range from a few hundred gigabytes to several terabytes. Higher capacity can improve usefulness, while price per gigabyte can change as capacity increases.
Health and write history
SMART data and write endurance help show how the drive has actually been used. A drive used for simple storage can have a very different history from one used for continuous caching or database workloads.
Interface and generation
SATA, Gen3, Gen4 and Gen5 products serve different buyers and system generations.
Physical condition
Damaged connectors, broken components, water exposure, corrosion, missing labels, damaged heatsinks and PCB damage can affect evaluation.
Quantity
A bulk lot requires a different process from a single SSD because grouped inventory, logistics and transaction planning matter.