Also: Don't confuse the system-side interface with the connector that joins the cable to the drive itself. On most newer portable SSDs, the connector at the SSD end is a USB Type-C port (the same as the kind you might find system-side)...

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Yes: Again, hard drives are slower because they have to physically rotate disks and move a reader arm to access your data. Just how much faster is it to read data from flash cells than from particular points on spinning platters? Typical throughput for consumer hard drives is in the range of 100MBps to 200MBps, while SSDs that support Thunderbolt 3 or 4, or USB 3.2 Gen 2x2, can have read and write speeds pushing 2,000MBps or even higher. (One factor in hard drive speed is spin rate—among external drives, 5,400rpm units are more common and more affordable than 7,200rpm.) CARRY WEIGHT. Most SSDs weigh a negligible couple of ounces. The carabiner retention loop of SanDisk's Extreme family of external SSDs is especially handy, because many SSDs are small and light enough that losing them is an easy and expensive mistake. The LED lights at the front of the drive light up green for USB 2.0 and blue for USB 3.0 connection. Its wraparound USB cable -permanently attached at one end saves you from losing the cable but if you need a longer cable you'll have to use a male/female cable in between. Arguably more important than the type of storage mechanism inside an external SSD is how it connects to your PC or Mac. Almost all external SSDs today plug into either some flavor of USB port, or a Thunderbolt 3 or 4 port.External solid-state drives are, essentially, internal SSDs (the same kind that power laptops or live inside desktops) with an outer shell and some bridging electronics. As a result, external drives use one of two internal "bus types" that, in part, dictate their peak speed: Serial ATA (SATA), or PCI Express (PCIe). The latter is usually associated these days with Non-Volatile Memory Express (NVMe), a protocol that is optimized for the characteristics of SSDs and speeds up data transfers.

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Many SSDs come with cables for both kinds (Type-A and Type-C) at the computer end, or one cable plus an adapter. Two full cables is generally best, as adapters can be awkward and easy to lose. You'll want to match what comes in the box with the ports your PC has (and has free). Also, match specs; spending extra, for example, for a 10Gbps USB 3.2 Gen 2 SSD if you only have 5Gbps-capable ports may be pointless. Note that various vendors use different nomenclatures. WD confusingly has two categories - external drives and portable drives - but includes products in the latter category in the former one while archrival Seagate categorizes them as desktop drives and portable drives. You will note that they removed the word "hard" and that's for a good reason: increasingly portable drives are based on flash components and in a near future - given the rapid drop in hardware pricing - we wouldn't be surprised to see multiple SSDs combined in a "desktop drive" How to choose the best external hard drive for you This is also where a spec known as the "terabytes written" rating (or TBW) comes in. It refers to how much data can be written to a drive over its life before some cells on that drive begin to fail. The entire drive itself won't stop functioning, but rather, less and less storage will be made available as time goes on.As you can see, some USB specs are tied to certain system-side physical USB connectors. We'll get into that in a moment.