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UnionSine 2.5" Portable External Hard Drive 500GB, Black
UnionSine

UnionSine 2.5" Portable External Hard Drive 500GB, Black

Bottom line: The UnionSine 2.5" Portable External Hard Drive 500GB: USB 3.0 interface rated up to 120MB/s, quick enough for HD video and photo libraries; main trade-off: 500GB is modest next to the 1TB and 2TB drives sold at similar prices.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ USB 3.0 interface rated up to 120MB/s, quick enough for HD video and photo libraries
  • ✓ Dual USB 3.0 and Type-C connectors fit both modern laptops and older desktops
  • ✓ Slim 2.5-inch shell and light weight slip into a bag or jacket pocket
  • ✓ Plug and play with no software to install; works with PC, Mac, laptops and consoles

Cons

  • ✗ 500GB is modest next to the 1TB and 2TB drives sold at similar prices
  • ✗ Mechanical 2.5-inch platter drive, far slower than an SSD on random access
  • ✗ 120MB/s is a ceiling; UnionSine notes real speed varies by hardware and OS
  • ✗ Usable formatted capacity lands below 500GB due to manufacturer counting differences

Manufacturer description

ldeal desktop backup for consumers who need extra storage for their important files.Due to differences in calculation methods between manufacturers and computer systems, the actual capacity of the hard drive may differ from the nominal capacity.10TB≈9.09TB,12TB≈10.9TB,14TB≈12.72TB,16TB≈14.54TB,18TB≈16.36TBPlease note:The Super Speed USB port will brings you high-speed data transfer experience.The actual transfer rate may vary depending on user's hardware configuration and operating system.

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SpecPicks Verdict

SpecPicks scored UnionSine 2.5" Portable External Hard Drive 500GB using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. UnionSine's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • Portable External Hard Drive: With a 2.5-inch slim profile and lightweight design, this external hard drive is designed for portability
  • High-Speed Data Transfers: The USB 3.0 interface provides fast data transfer speeds of up to 120MB/s for quick access to your files and media
  • Wide Compatibility: UnionSine hard drive compatible with multiple devices, including PC, Mac, laptop, and gaming consoles
  • High-Performance Storage Solution: The external hard drive chip adds a signal shielding layer, the transmission speed of the hard disk will be faster than other hard disks, stable and undisturbed
  • Plug and Play: With no software to install, just plug it in and the drive is ready to use
  • 500GB Storage Capacity: Provides ample storage space for your documents, photos, videos, music, and games with 1TB capacity

Full Specifications

BrandUnionSine
Colorblack
Model NameHD3513-500GB
Read Speed120 megabytes_per_second
Unit Count1 Count
Form Factor2.50 inches
ConnectivityUSB
Model NumberHD3513-500GB
CompatibilityPC, Mac
Plug and PlayWith no software to install, just plug it in and the drive is ready to use
Built-In MediaExternal Hard Drive, Installation Guide, USB Cable
Hard-Drive Size500 GB
Mfr Part NumberHD3513-500GB
Number of Items1
Special FeatureBackward Compatible, Portable
Hardware PlatformLinux, Mac, PC
Installation TypeExternal Hard Drive
Compatible DevicesDesktop, Laptop, Tablet, Television
Data Transfer Rate5 gigabits_per_second
Wide CompatibilityUnionSine hard drive compatible with multiple devices, including PC, Mac, laptop, and gaming consoles

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UnionSine 2.5" Portable External Hard Drive 500GB, Black is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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UnionSine 2.5" Portable External Hard Drive 500GB, Black
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