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1 TB is 1,000,000,000,000 bytes when a storage device is specified using decimal units. It is not the same as 1 TiB, the binary unit equal to 240 bytes. That difference, plus space used by formatting and system software, explains why a device may show less capacity available for your files than its label suggests.
How much storage is 1 TB?
In the decimal system used for storage-device specifications, 1 terabyte (TB) equals 1 trillion bytes, or 1,000 gigabytes (GB). Apple Support describes manufacturers’ use of decimal measurement in its capacity explanation.
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Binary units use different values. A tebibyte (TiB) is 240 bytes, or 1,099,511,627,776 bytes. In the binary convention described by Apple, 1 GiB is 1,073,741,824 bytes. NIST defines the binary prefix and TiB in its binary-prefix reference and glossary. Use TB and TiB carefully: they are not interchangeable.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsWhy does a 1 TB drive show less capacity?
There are two separate reasons the number shown or available can be lower than the product’s advertised decimal capacity:
#1 Best Overall
- Solid state performance with up to 800MB/s read speeds in a portable drive. (Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes.)
- Back up your content and memories on a storage solution that fits seamlessly into your mobile lifestyle.
- Take it with you on your adventures—up to two-meter drop protection means this durable drive can take a beating. (Based on internal testing.)
- Secure it to your belt loop or backpack for extra peace of mind thanks to the tough rubber hook.
- From Sandisk, a brand professional photographers trust to take on assignments.
- Different unit conventions: Some operating systems and apps calculate capacity using binary multiples, even when a display labels the result with decimal-style terms such as GB. A 1 TB device is about 931 GiB when its decimal byte count is divided into binary gibibytes. The displayed figure can therefore look smaller without indicating a defect or missing data.
- Formatting and system use: Formatting structures the storage for use, and the operating system may use additional space. The amount varies by device and software, so there is no universal usable-capacity figure for every 1 TB product.
To understand a particular display, check which unit the operating system actually uses and distinguish total device capacity from free space. A number such as 931 GB on a screen may reflect binary arithmetic presented under a different label; it is not, by itself, evidence that files have vanished.
How many files can 1 TB hold?
Capacity alone cannot give a reliable count of photos, videos, songs, or documents. File sizes vary with resolution, recording quality, format, compression, and the content itself. For a useful estimate, find the typical size of the files you plan to store, then divide the usable capacity by that size. For example, the calculation needs both a stated average file size and the device’s available space; without those inputs, a single file count would be misleading.
Rank #2
- 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.
What kinds of storage can have 1 TB capacity?
One terabyte describes capacity, not the way storage is connected or accessed. NIST’s October 2020 publication on storage infrastructure covers direct-attached, networked, and cloud-based storage. Its portable-storage definition includes removable hard drives and SSDs.
- Direct-attached storage: Connects to an individual device, such as an external drive.
- Network-accessed storage: Reached over a network and potentially shared among devices.
- Cloud storage: Accessed through a cloud service rather than a drive physically connected to the device.
When choosing among these arrangements, consider where you need access, whether you need to carry the storage, device and operating-system compatibility, and how much usable space you need. For a specific drive or service, verify its connector or requirements, current price, warranty, and any subscription or storage limits with the provider.
Quick Recap
Best Value
- Note: Magsafe is not available in this version
- High-speed Data Transfer: Lexar external SSD ES3 supports USB 3.2 Gen 2 up to 1050MB/s read and 1000MB/s write to transfer files fast for more efficient work. (Performance may be lower if not supporting USB 3.2 Gen 2 on Mac and other systems)
- Wide Compatibility: Lexar Portable SSD ES3 compatibility with iPhone 17 series (Not supported on iPhone 14 and older models), Android mobile devices, laptops, cameras, Xbox X|S, PS4, PS5, gaming console, and more
- On The Go: Lexar external solid state drive ES3's thin, stylish, and durable design, weighs 42g and is only 10.5mm thick, making it smaller than a card and easily fits in your pocket. It comes with a Type-C cable for plug-and-play convenience
- Data Safety First: Lexar SSD ES3 includes Lexar DataShieldTM 256-bit AES encryption software to protect files
Rank #4
- NEARLY 2X FASTER THAN OUR PREVIOUS GENERATION(8) – move 1,000 high-res photos in under 60 seconds(6) with up to 2000MB/s transfer speeds(2).
- IP65 RATING AND UP TO 3M DROP PROTECTION(3) – protects against spills and drops.
- POCKET-SIZED – fits easily in pockets and small bags.
- SPACE TO OWN YOUR AI CONTENT – speed and capacity to download your high-res clips and photo edits.
- 256-BIT AES ENCRYPTION(4) – helps keep private files secure with password protection.
Rank #3
- MADE FOR THE MAKERS: Create; Explore; Store; The T7 Portable SSD delivers fast speeds and durable features to back up any endeavor; Build your video editing empire, file your photographs or back up your blogs all in an instant
- SHARE IDEAS IN A FLASH: Don’t waste a second waiting and spend more time doing; The T7 is embedded with PCIe NVMe technology that brings fast read and write speeds up to 1,050/1,000 MB/s¹, making it almost twice as fast as the T5
- ALWAYS MAKE THE SAVE: Compact design with massive capacity; With capacities up to 4TB, save exactly what you need to your drive – from large working files to game data and everything in between
- ADAPTS TO EVERY NEED: Whether using a PC or mobile phone, count on the T7 for extensive compatibility²; It’s a true team player when it comes to heavy-duty application usage or file-saving
- HI RESOLUTION VIDEO RECORDING: Record Ultra High Resolution (4K 60fs) videos directly onto the T7 Portable SSD with your favorite camera or mobile devices; Supports iPhone 15 Pro Res 4K at 60fps video and more³
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