Questions about example sentences with, and the definition and usage of "Ssds"

A: × More and more SSDs have been used for recording media instead of HDDs.
✓ More and more, SSDs have been used for recording media instead of HDDs.

× SSDs have high performance and stability, so it makes sentence.
✓ SSDs have high performance and stability, so it makes sense.

× They are still expensive than HDDs, but they has gradually been affordable.
✓ They are still more expensive than HDDs, but they have gradually become affordable.

A: or "I wonder if I should go get one."
But the SSDs are still very expensive if you want a larger storage capacity like 1TB..