Both laptops have a 2.5" bay for you to install a hard drive (HDD) or a SSD (Solid State Drive). SSDs have much higher read / write speeds compared to HDDs, however, they are also more expensive. A laptop with a HDD could take 45 to 60 seconds to boot up compared to a laptop with a SSD that can boot up in 20 seconds or less. Generally speaking, programs launch much faster from a SSD; they make laptops feel more responsive compared to HDDs because of the speed at which programs load.
Here's an example of a 2.5" 1TB HDD for laptops which only costs $50.
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/www.amazon.com/Seagate-BarraCuda-2-5-Inch-Internal-ST1000LM048/dp/B01LYNQXCP/ref=sr_1_3?ie=UTF8&qid=1507039241&sr=8-3&keywords=2.5%22+1tb+hard+drive
Here's a 2.5" 1TB SSD which sells for $280. It is one of the least expensive 1TB SSDs from a reputable brand name.
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/www.amazon.com/Crucial-MX300-Internal-Solid-State/dp/B01IAGSDUE/ref=sr_1_3?s=electronics&ie=UTF8&qid=1507039446&sr=1-3&keywords=2.5%22+1tb+ssd
You will also need to purchase an operating system (OS). Each laptop will need it's own OS which means you need to purchase two copies. Below is a link to purchase Windows 10 for $110 each.
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/www.amazon.com/gp/huc/view.html?ie=UTF8&newItems=C1970350c-e58b-4931-9837-08898140c20d%2C1