This question examines the basic knowledge of SSDs and HDDs, focusing on their characteristics. The correct answer is B, as SSDs are known for their faster data access speeds due to the lack of moving parts, unlike HDDs. Option A is incorrect because SSDs often have lower storage capacities compared to HDDs at similar price points. Option C is incorrect as SSDs have no moving parts, which is one of their advantages. Option D is incorrect because SSDs generally have a higher cost per gigabyte than HDDs.