Add it. It might be like trying to sell a bike with flat tires. You run the risk detering prospective buyers who:
a. are forced to go on nothing but your word (that it, otherwise, functions)
b. may consider the task daunting or intimidating
c. are unable to envision the bigger picture
A small investment will earn you far more in the end. Most people do not want to buy a ‘project.’ Those that are willing will typically expect a major discount, and rightly so.
Whitenoise is right. Turn it into your advantage and install a bigger drive. Prospective buyers don’t have to know that the new and improved drive is there by default. Not long ago I found a vintage jacket that, upon bringing it home, I discovered had a broken zipper. It was an old and rare dark teal 1980’s Members Only jacket, so I wasn’t quite ready to scrap it. My initial goal was to sell it on ebay, as I had many others in the past. I turned the flaw into a selling point by paying a seamstress to install a white zipper. There are no Members Only jackets with varying zipper colors. This repair cost me $12 but I was able to advertise the jacket as ‘custom.’ It worked. There were a ton of bids and that small investment, plus some creativity, earned me way more than I would have made in the first place. There was no mention of broken zippers, only phrases like ‘one of a kind.’