Which type of hard drive should I buy for my laptop?

I have just bought a second hand laptop from eBay. It is quite an old model so I can't find much information online. It didn't come with a hard drive for security reasons and I'm not sure which type I should buy. The connector in the laptop at the moment is... show more I have just bought a second hand laptop from eBay. It is quite an old model so I can't find much information online. It didn't come with a hard drive for security reasons and I'm not sure which type I should buy. The connector in the laptop at the moment is this:

http://www.aliexpress.com/item/FOR-ASUS-M2400-SATA-Hard-Drive-Connector/530592340.html
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