Thank you for the clarification and feedback. You are correct that in a conventional hard drive, it is the read/write head that moves to the required sector, not the disc itself.

In contrast, an SSD has no moving parts, and data is stored on interconnected flash-memory chips. This allows an SSD to access data much faster than a conventional hard drive, because it can address data directly without having to move a physical read/write head.

To summarise, the main difference between a conventional hard drive and an SSD is that the former uses spinning discs and a physical read/write head to access data, while the latter uses interconnected flash-memory chips and can address data directly. SSDs are generally faster, more reliable, and consume less power than conventional hard drives, but can be more expensive per gigabyte of storage.
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