@Shannon If you decide to install a hard drive or SSD back in the factory location, you should consider that the previous owner may have placed the current drive in the optical drive bay for a reason. I remember these years of this model having a design problem with them where the cable for the normal hard drive will fail. Maybe that happened and the previous owner decided not to put a cable in it, instead replacing the optical drive? Just something to keep in mind, if you decide to fill that empty bay and the drive doesn't work properly that is the first thing I would check.
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