I had two Iomegas (my two oldest still work very well) and two Seagates (one broke about a year after purchase and had to be thrown out, the other still works fine, newer, higher capacity but slower than Iomega portable drives) USB 2.0. This is my first USB 3.0 portable drive and so far it's been excellent. It's faster than the rest, not only when plugged into a USB 3.0 port (as expected), but even when plugged into a USB 2.0 port.
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
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8TB Seagate Backup Plus Hub Desktop Hard Drive with Data Recovery Services
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2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
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π Seagate Expansion 3TB Portable USB 3.0 External Hard Drive (STEA3000400) in Black
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π StarTech.com 3.5in Silver Aluminum USB 3.0 External SATA III SSD / HDD Enclosure with UASP - Portable USB 3 3.5" SATA Hard Drive Housing (S3510SMU33)
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SAMSUNG T7 Portable SSD 1TB: Fast and Reliable USB 3.2 External Solid State Drive in Gray
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π΄ Renewed Samsung Portable SSD T7 500GB USB 3.2 External Solid State Drive Red
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Samsung T5 Portable SSD MU PA500B
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