Outdated Drivers Are Slowing You Down
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallA 1 TB drive contains 1,000,000,000,000 bytes, but a computer may display that capacity as about 931 “GB.” That familiar difference is mainly a unit-conversion issue: the displayed number is often calculated in binary-sized units, which are larger than decimal gigabytes. Formatting and system software can reduce the space available for your files further, but those are separate effects.
Why does a 1TB drive show about 931GB?
Drive makers rate capacity in decimal units: 1 TB is 1,000,000,000,000 bytes. A binary gibibyte (GiB), by contrast, is 1,073,741,824 bytes. Divide the drive’s byte count by the size of a GiB and the result is about 931.3 GiB. Some software labels this binary-sized result “GB,” which makes the drive appear smaller than its decimal product rating.
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Seagate describes decimal capacity as the storage-industry standard and gives the rounded example of a 1 TB drive appearing as 931 GB in Windows’ binary-output calculation. Treat that as an example, not a promise about every operating-system version or every formatted drive. Seagate’s capacity-measurement explanation covers the unit distinction; its reported-capacity article provides the rounded Windows example.
What do TB, GB, TiB, and GiB mean?
Decimal and binary prefixes count bytes differently. The International Electrotechnical Commission approved binary prefixes in December 1998; NIST’s reference lists their symbols and powers. NIST’s binary-prefix reference identifies Gi as 230 and Ti as 240.
#1 Best Overall
- Easily store and access 1TB to content on the go with the Seagate Portable Drive, a USB external hard drive.Specific uses: Personal
- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop. Reformatting may be required for Mac
- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
| Unit | Meaning | Bytes |
|---|---|---|
| GB | Decimal gigabyte | 1,000,000,000 |
| TB | Decimal terabyte | 1,000,000,000,000 |
| GiB | Binary gibibyte | 1,073,741,824 |
| TiB | Binary tebibyte | 1,099,511,627,776 |
Thus, the same 1,000,000,000,000 bytes equal 1 TB or about 0.91 TiB. The bytes have not vanished; the numeric value changes because a TiB contains more bytes than a TB. Apple likewise defines 1 GB as 1 billion bytes and 1 TB as 1 trillion bytes in its storage-capacity explanation.
Why can usable space be lower still?
The unit conversion explains why the number can look about 7% lower when binary-sized units are labeled “GB”; it is not filesystem overhead. A separate reduction occurs when a drive is formatted and when the operating system reserves storage. Apple says “Actual formatted capacity less” and explains that formatting uses some capacity while the operating system uses additional storage. The amount varies by device and configuration; there is no universal percentage to subtract.
Rank #2
- 【Versatile Storage Expansion – For Gaming, Work & Everyday Use】 Running out of space on your PS5 or Xbox Series X/S? This external hard drive lets you store and play PS4 / Xbox One games directly, instantly freeing up your console’s internal storage for next‑gen titles. At the same time, it handles work file backups, media libraries, and cross‑device data transfers with ease. One drive, all your needs. *（Note: PS5 / Xbox Series X|S games cannot be run or stored directly from the external hard drive. However, by offloading your PS4 / Xbox One games, you can free up valuable space for newer titles.）*
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Keep four readings distinct when diagnosing the difference:
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- Device capacity: the total bytes represented by the drive’s product rating.
- Displayed capacity: those bytes converted and labeled according to the operating system’s unit convention.
- Formatted or available capacity: what remains available on a volume after formatting and system use.
- File size: space consumed by files, best compared using the same unit convention—or exact byte counts.
How to check whether a drive is reporting normally
- Find the exact byte count, if available. It is a more reliable basis for comparison than a rounded “GB” figure.
- Identify the units behind the display. Compare decimal TB/GB with binary TiB/GiB rather than assuming two “GB” labels mean the same calculation.
- Check what the reported figure describes. A raw device total, a partition, and a formatted volume with system storage are different measurements.
- Investigate any unexplained remainder. Consult the device and operating-system documentation. Seagate notes that older BIOS limitations can affect reported capacity; that is one possible factor, not a diagnosis for every current system.
Reformatting will not recover the apparent decimal-to-binary difference: it does not change how the same bytes convert between units, and reformatting can erase data.
Quick Recap
Best Value
- All-in-One Design: 1TB external hard drive, multi-port hub and SD/TF card reader combine to provide ample storage and comprehensive connectivity in a single device for seamless multi-device connectivity to enhance your productivity.
- Multiple Interface Support: The product has a built-in 1TB hard disk and supports USB-C, USB 3.2, USB 2.0, SD card slot and TF card slot, which meets the needs of daily work. The product connects to the computer via data cable to realize multi-device interoperability.
- Dual Socket Data Connection Cable: Equipped with USB 3.2 and USB-C dual socket data connection cable, suitable for more models.
- Wide compatibility: Supports Windows, Mac OS, Linux, Android, iOS （iPhone 15 and Later） and other operating systems. Support Desktops, Laptops, SmartPhones, Tablets, TVs and other devices.
- Note: This is only compatible with Apple devices that have a USB‑C port (including iPhone 15 and later, as well as all iPads with USB‑C). Using a Lightning to USB‑C adapter will not resolve the compatibility issue.
Rank #4
- 【Upgraded version】 - The mirror logo strip is combined with the striped non-slip design. The rounded corners of the shell are more suitable for holding. The strips play a heat dissipation function to ensure a stable and fast transmission process.
- 【Ultra-thin and quiet】 - The motherboard adopts JMicron 578 noise-free solution, giving you a quiet working environment. Lightweight and portable size designed to fit in your pocket for easy portability.
- 【Ultra-Fast Data Transfers】 - Pairing this external hard drive with JMicron 578 solution USB 3.0 and USB 2.0 interfaces enables blazing-fast data transfer. It boasts theoretical read speeds of up to 125MB/s and write speeds of up to 103MB/s.
- 【Plug and Play】 - With no software to install, just plug it in and the drive is ready to use.The hard disk chip is wrapped with an aluminum anti-interference layer to increase heat dissipation and protect data.
- 【What You Get】 - 1 x Portable Hard Drive, 1 x USB 3.0 Cable, 1 x User Manual, Gift-type shell packaging ,Three-year manufacturer's warranty and free technical support services.
Rank #3
- Easily store and access 2TB to content on the go with the Seagate Portable Drive, a USB external hard drive
- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
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