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A USB 3.0 flash drive can connect to a USB 2.0 port, but it will transfer at the slower connection’s capability. The main difference is the interface tier: USB 2.0 High-Speed signals at 480Mbps, while the tier historically called USB 3.0 signals at 5Gbps. Neither figure guarantees a particular file-copy speed; the drive’s hardware, host port, and files being transferred all matter.
USB 3.0 vs. USB 2.0: what is the speed difference?
USB 2.0 High-Speed has a signaling rate of 480Mbps. The original USB 3.0 tier signals at 5Gbps. That is a higher interface rate, not a promise that every USB 3.0 flash drive will copy files at a fixed multiple of a USB 2.0 drive’s speed. Signaling rate describes the connection; actual file transfers also depend on the flash memory and controller inside the drive, the host port, and the workload.
USB-IF’s current naming places the historical 5Gbps USB 3.0 tier under USB 3.2 Gen 1, with the marketing name SuperSpeed USB. The USB 3.2 specification also includes 10Gbps and 20Gbps tiers. Thus, a product labeled USB 3.0 and one labeled USB 3.2 Gen 1 may refer to the same 5Gbps signaling tier; check a drive’s stated capabilities rather than relying on the name alone. USB-IF summarizes the specification and its tiers on its USB 3.2 overview.
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Yes. USB products are backward compatible, and USB-IF says they “will operate at lowest common speed capability.” A USB 3.0 flash drive connected through a USB 2.0 port can be used, but it cannot use the 5Gbps link tier over that connection. Likewise, a USB 2.0 drive connected to a faster port remains limited by its own USB 2.0 capability.
#1 Best Overall
- High-speed USB 3.0 performance of up to 150MB/s(1) [(1) Write to drive up to 15x faster than standard USB 2.0 drives (4MB/s); varies by drive capacity. Up to 150MB/s read speed. USB 3.0 port required. Based on internal testing; performance may be lower depending on host device, usage conditions, and other factors; 1MB=1,000,000 bytes]
- Transfer a full-length movie in less than 30 seconds(2) [(2) Based on 1.2GB MPEG-4 video transfer with USB 3.0 host device. Results may vary based on host device, file attributes and other factors]
- Transfer to drive up to 15 times faster than standard USB 2.0 drives(1)
- Sleek, durable metal casing
- Easy-to-use password protection for your private files(3) [(3)Password protection uses 128-bit AES encryption and is supported by Windows 7, Windows 8, Windows 10, and Mac OS X v10.9 plus; Software download required for Mac, visit the SanDisk SecureAccess support page]
Why advertised interface speed is not copy speed
A USB tier tells you what the connection supports, not what a particular flash drive can sustain when reading or writing. The memory and controller in the drive may be slower than the interface. A port or other part of the connection can also be a bottleneck. Read and write performance can differ, and a result for one model should not be treated as representative of all drives in its category.
A model-specific example
Kingston’s DataTraveler R3.0 datasheet lists 70MB/s read and 30MB/s write over USB 3.0, compared with 30MB/s read and 25MB/s write over USB 2.0. Kingston identifies these results as based on its internal testing. They illustrate how the same drive’s listed performance can vary by connection, but they are not universal averages or current benchmarks for flash drives generally. See the Kingston DataTraveler R3.0 datasheet for the model-specific figures.
Rank #2
- The durable, light-weight design of the Turbo Attaché 3 USB 3.0 Flash Drive is the essential mobile storage solution
- Perfect for transferring large files such as movies, videos, photos, music & documents
- Transfer speeds up to 10 times faster than standard USB 2.0 flash drives
- Convenient sliding collar, and cap-less design protects your content when not in use
- Compatible with most PC and Mac laptop and desktop computers with USB 3.0 ports
Large files and many small files
A headline speed may describe a particular test or transfer pattern. Copying a few large files is not the same workload as copying many small ones, so a manufacturer’s rated speed may not predict the time for every task. If your use involves frequent transfers, look for both rated read and write performance for the exact model and treat those figures as product-specific.
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Best Value
- The durable, light-weight design of the Turbo Attaché 3 USB 3.0 Flash Drive is the essential mobile storage solution
- Perfect for transferring large files such as movies, videos, photos, music & documents
- Transfer speeds up to 10 times faster than standard USB 2.0 flash drives
- Convenient sliding collar, and cap-less design protects your content when not in use
- Compatible with most PC and Mac laptop and desktop computers with USB 3.0 ports
Rank #4
- Lightweight and convenient: Lexar JumpDrive A30E (USB Type-A) boasts a slim, portable design for easy device compatibility; lightweight at 7.41 g
- Transfer speeds up to 100 MB/s: 10x faster than standard USB 2.0 drives; Based on internal testing, performance may vary depending upon the host device, interface, and usage conditions
- Wide compatibility: Compatible with tablets, laptops, Macs, and traditional Type-A devices, no software installation required; Reliably stores photos, videos & files
- Compact: Features a push-button retractor and a lanyard loop for on-the-go use
- Enhanced security: Lexar DataShield protects files, easily creates a password-protected safe with auto-encryption; Files deleted from the safe are securely erased and can't be recovered
Rank #3
- USB-C 2-in-1 storage OTG: The Lexar JumpDrive Dual Drive D40E features USB Type-A and Type-C connectors in a slim, portable form factor for easy device compatibility
- Transfer speeds up to 100MB/s: Based on internal testing, performance may vary depending upon the host device, interface, and usage conditions. 1MB=1,000,000 bytes
- Plug and Play: Widely compatible with USB Type-C smartphones, tablets, laptops, Macs, and traditional Type-A devices, no software installation required. The 360° swivel design allows for easy switching between connectors without the hassle of losing a cap
- Durable & Compact: The Lexar D40E USB memory stick features a metal enclosure, withstands temperatures from 0° to 50° C (32°F to 122°F), and is lightweight at 26g with dimensions of 70.4 x 16.9 x 11.7mm
- Security & Warranty: Securely protects files using an advanced security software solution with 256-bit AES encryption. Backed by a Lexar 3-year limited warranty
How to choose a flash drive for your port and workload
- Check the host port. Identify whether the port you plan to use supports USB 2.0 or a SuperSpeed tier. The connection cannot reach a faster tier than the port supports.
- Check the drive’s interface tier. USB 3.0 and USB 3.2 Gen 1 can identify the same 5Gbps signaling tier. Confirm the supported tier in the product specifications.
- Compare rated read and write speeds. Use the manufacturer’s figures for the specific model, not the interface label as a substitute for performance information.
- Match the drive to your files and capacity needs. Consider whether you mostly move large files or many small ones, and choose enough capacity for the material you intend to carry.
- Verify the exact product listing. Product availability and specifications can change; check the current listing or manufacturer page before buying.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
