Recover external Disk capacity

JohnM40

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Running Windows 7 Home Premium 64 byte. Have a 1 tb external Seagate drive connected with USB 2. Disk capacity is showing 925GB. Have lost 75 GB. Is there a way to recover the the lost 75 GB?
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Dell XPS 8700
OS
Windows 7 Home Premium 64bit.
CPU
Intel Core i7 4790 Haswell
Motherboard
Dell Inc. Model 0KWVT8
Memory
DDR3 Size 24576 MBytes
Hard Drives
Samsung SSD 850 EVO 250G SCSI Disk Device (System Disk)
1TB HHD (Storage)
Welcome to Seven Forums.
You have not lost any capacity, the difference is the way drive makers and Windows measure it. Windows uses binary system and makers use decimal.
Example:
Binary, 1MB=1048576 bytes
Decimal 1MB=1000000 bytes
Windows would show a decimal MB as 976.5KB
The drive may have some native files that came with it too, like encryption and software.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home Built Desktop By DataTech
OS
Windows 7 Ultimate X64 SP1
CPU
Intel i5-2550K, Differing ~4.4-4.8GHz No built in GPU
Motherboard
ASUS P8Z68-V PRO/GEN3
Memory
16GB G.Skill Sniper 1866MHz @ 2133MHz 2x8GB
Graphics Card(s)
ASUS GTX650TIB-DC2OC-2GD5, (650TI Boost)
Sound Card
Onboard Realtek 5-1
Monitor(s) Displays
Samsung P2570HD
Screen Resolution
1920x1080
Hard Drives
Samsung 840 Pro 256GB SSD for OS, 500GB Seagate Constellation (Enterprise drive) for Data
PSU
Corsair HX650W
Case
Inwin Dragon Rider
Cooling
Hyper 212 EVO w/two Noctua fans, push-pull, @1300 RPM
Keyboard
E-Z Eyes, bright yellow keys with large characters
Mouse
steelseries SENSEI Laser Pro Gaming
Internet Speed
48-51Mbs Mbs down, 11 Mbs up Xfinity Cable
Antivirus
Norton Internet Security 2013
Browser
IE 10, Opera, Pale Moon if needed
Other Info
4 case fans, LG BluRay-RE, ASUS DVD-RW, Mr. Fusion power supply, 1.21 gigawatts.
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