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For consumers, there are two main companies that sell surveillance hard drives – Western Digital and Seagate. Please refer to the prior section to determine the best size hard drive for your given circumstance. The main differences below are the Cache Size, Speed, and Storage Capacity. Hard drives with a higher cache and speed are superior, but keep in mind that you might not notice a difference from the higher cache and speed for surveillance hard drives as it’s generally writing a constant stream 24/7. As you’ll see, certain Western Digital Purple hard drives come with a longer warranty and