Usable with USB 2.0 and USB 3.0 without reformat?

USB 2.0 TO SATA 2.5” HDD Enclosure Transystar Technology

500 GB Ultra Slim 2.5″ External USB 2.0 Hard Disc Drive

USB 2.0 Hight Speed Interface 5400rpm 1.8” HDD case

500 GB Ultra Slim 2.5″ External USB 2.0 Hard Disc Drive

Portable SATA Hard Drive k200model USB 2.0 High-speed Interface 250G

500 GB Ultra Slim 2.5″ External USB 2.0 Hard Disc Drive

2.5″ SATA USB 2.0 External Hard Drive case Duralumin Fashion King Kong

USB 2.0 Popular Slim External Drive

Cavalry 1TB USB 2.0 External Hard Drive

Cavalry 500GB USB 2.0 External Hard Drive

Speed Metal 160G External USB Hard Drive

Western Digital 250GB USB 2.0 New External Hard Drive

How to make external hard disk run faster