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It can accept both sizes: 2.5" SSDs and HDDs and 3.5" HDDs. If you don't know, SSD = Solid State Drive, which only comes in the 2.5" laptop size form factor, and HDD = Hard Disk Drive, more commonly called a Hard Drive like your abbreviation HD. Be sure to select Drives from the Netgear ReadyNAS Compatibility List (Select Device) at https://kb.netgear.com/20641/ReadyNAS-Hard-Disk-Compatibility-List It's a pretty long list, so I just selected from the Western Digital 3.5" HDDs as they are cheaper than SSDs (especially the Samsung SSDs which are the only ones listed above 128GB), and because HDDs don't have the same Write/Rewrite/Erase usage and Format life limits. And if you don't know, SSDs should NEVER be Formatted after the initial Format for an OS ("Operating System" like Windows) or Data. That can make them go bad much sooner. But SSDs do operate MUCH faster than HDDs, so it's up to you and your Drive budget. I copied the whole Compatibility List into an Excel Spreadsheet so I could Sort it by Vendor, then Capacity, then Disk RPM (which also shows if its an SSD), and then Disk Type, which accommodated finding the Western Digital Drives at the bottom (or whatever Vendor you're looking for) all together and sorted by Capacity, etc., as described. Note: I avoided consideration of all Drives slower than SATA III 6Gb/s for the best performance and also considered the largest Cache sizes, so read through the list carefully (sorting in a spreadsheet makes this much easier). Once you get a few HDDs into consideration, then research each one's MB/s speeds because that varies with Capacity, Cache, and Type, and will tell you more about overall Performance. Some 5400 RPM HDDS have a higher MB/s than some 7200 RPM in a particular Capacity, including some 5400 RPMs with a smaller Cache. I didn't research them, but they might be Hybrid HDDs with a Solid State Cache. I hope this helps... if you're still looking for one after 6 months.
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