TechCompare LogoTechCompare

Transferring 1 TB over USB 3.0 takes 26m 40s

A 1 TB transfer over USB 3.0 works out to 26 minutes 40 seconds at the interface's 5 Gbps peak data rate. In practice, sustained throughput on SATA SSDs brings this closer to 35–40 minutes; on HDD-based external drives it can stretch to well over an hour.

Transfer time
26m 40s
At peak link speed
File size
1 TB
1000 GB
Link speed
5,000 Mbps
USB 3.0 (5 Gbps)

Calculator

Data Transfer Calculator

Configuration

Mbps
Estimated Transfer Time
26m 40s

Speed Comparison

USB 2.0
4h 37m 46s
480 Mbps
USB 4 / Thunderbolt 4
3m 20s
40 Gbps
Gigabit Ethernet
2h 13m 20s
1 Gbps
10 Gigabit Ethernet
13m 20s
10 Gbps
WiFi 5 (ac)
5h 33m 20s
400 Mbps
WiFi 7 (be)
26m 40s
5 Gbps
SATA SSD
30m 18s
4.4 Gbps
NVMe Gen4 SSD
2m 22s
56 Gbps

How this is calculated

This is the mid-point case most people hit when migrating a laptop drive or moving a media library to backup. USB 3.2 Gen 2 (10 Gbps) cuts the theoretical time roughly in half — 13m 20s — but only if the source and destination drives can both sustain it. NVMe-based portable SSDs like Samsung's T7 comfortably use all 10 Gbps; SATA SSDs and HDDs can't.

Verdict

1 TB over USB 3.0 is the boundary where interface speed starts to matter — 26m 40s theoretically, 35–60m in practice. If you're doing this often, upgrading to a USB 3.2 Gen 2 or Thunderbolt-capable setup is worth the money.

More USB scenarios

100 GB over USB 3.0
USB 3.0 (5 Gbps)
View details ➜
4 GB over USB 2.0
USB 2.0 (480 Mbps)
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.

Related tools

Display Bandwidth Calculator

Check if your HDMI/DP cable supports your resolution and refresh rate.

Use tool ➜

RAID Calculator

Calculate usable capacity and fault tolerance for RAID 0, 1, 5, 6, and 10.

Use tool ➜

RAM Latency Calculator

Convert DDR3/DDR4/DDR5 timings (CL, tRCD, tRP, tRAS) into true latency in nanoseconds.

Use tool ➜

Data Read Visualizer

Visualize the massive speed difference between CPU cache, RAM, and storage.

Use tool ➜