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Transferring 4 GB over USB 2.0 takes 1m 6s

A 4 GB transfer over USB 2.0 works out to 1 minute 6 seconds at the interface's 480 Mbps peak rate. 4 GB is the traditional DVD image size and a useful reference point for what USB 2.0 can still practically handle in 2026 — mostly bootable installer images, archival transfers, and anything writing to an older flash drive.

Transfer time
1m 6s
At peak link speed
File size
4 GB
4 GB
Link speed
480 Mbps
USB 2.0 (480 Mbps)

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Configuration

Mbps
Estimated Transfer Time
1m 6s

Speed Comparison

USB 2.0
1m 6s
480 Mbps
Selected
USB 4 / Thunderbolt 4
< 1 second
40 Gbps
Gigabit Ethernet
32s
1 Gbps
10 Gigabit Ethernet
3s
10 Gbps
WiFi 5 (ac)
1m 20s
400 Mbps
WiFi 7 (be)
6s
5 Gbps
SATA SSD
7s
4.4 Gbps
NVMe Gen4 SSD
< 1 second
56 Gbps

How this is calculated

Typical USB 2.0 flash drives sustain roughly 15–25 MB/s (120–200 Mbps) rather than the protocol's 60 MB/s ceiling, which doubles or triples real-world times. That's why Windows installer images (usually 4–5 GB) take 5–8 minutes to write to a USB 2.0 stick using tools like Rufus — the interface isn't the bottleneck; the NAND's sequential write speed is.

Verdict

USB 2.0 is fine for bootable installers and one-off small transfers — 1m 6s for 4 GB at peak, 2–3 minutes typically. For anything larger or repeated, a USB 3.0 or newer drive is cheap enough to be worth replacing.

More USB scenarios

100 GB over USB 3.0
USB 3.0 (5 Gbps)
View details ➜
1 TB over USB 3.0
USB 3.0 (5 Gbps)
View details ➜

Frequently asked questions

How long does it take to transfer 1 TB over Gigabit Ethernet?
At a theoretical 1000 Mbps (125 MB/s), 1 TB takes about 2 hours and 13 minutes in ideal conditions. Real-world speeds over Gigabit Ethernet typically top out around 110-115 MB/s due to TCP overhead, so budget closer to 2.5 hours for a full 1 TB copy.
Why is my real transfer speed slower than the cable's rated speed?
Rated speeds are raw signalling rates in bits per second. Protocol overhead (TCP/IP, USB framing, filesystem operations), encryption, small-file latency, and the slowest device in the chain (often the disk, not the cable) all reduce usable throughput. A USB 3.0 port rated 5 Gbps usually delivers around 400 MB/s in practice, not the theoretical 625 MB/s.
What's the difference between megabits (Mbps) and megabytes (MB/s)?
There are 8 bits in a byte, so 1000 Mbps equals 125 MB/s. Network speeds and ISP plans are advertised in megabits per second, while file sizes and storage speeds are measured in megabytes per second. Dividing Mbps by 8 gives you the MB/s figure you actually see when copying files.
How fast is WiFi 6 compared to Gigabit Ethernet for file transfers?
WiFi 6 can exceed Gigabit Ethernet on paper (up to ~9.6 Gbps theoretical) but real-world throughput usually lands between 500 Mbps and 1.5 Gbps depending on distance, interference, and client hardware. For a single large file transfer, wired Gigabit is still more consistent; WiFi 6E or WiFi 7 can edge ahead in ideal conditions.
Is USB 4 or Thunderbolt 4 faster for copying files?
Both use the same 40 Gbps underlying spec and deliver comparable real-world speeds of around 2800-3200 MB/s for sustained transfers. Thunderbolt 4 guarantees the full 40 Gbps and PCIe 32 Gbps tunnel; USB 4 allows 20 Gbps implementations, so check the port's actual spec rather than assuming parity.
Does file size affect transfer speed?
Yes — significantly. Transferring one 50 GB file hits near-maximum throughput, but copying 50 GB of small files (thousands of photos, say) can be 5-10x slower because every file has filesystem and metadata overhead. For large migrations, compressing into an archive first is often faster end to end.

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