• Thunderbolt connectivity
  • Transfer speed: up to 10 Gbps
  • Ideal for MacBook Pro / MacBook Air / Mac Mini / Mac Pro
  • JetDrive Toolbox monitoring software
  • Up to 1,600MB/s read and 1,400MB/s write speeds

The Transcend JetDrive 855 Portable 960 GB External SSD combines a JetDrive 850 PCIe SSD with a sleek aluminium Thunderbolt enclosure to instantly revitalize your Thunderbolt-equipped MacBook Pro, MacBook Air, Mac mini, or Mac Pro! 

Thunderbolt technology in a sleek case 
Transcend's JetDrive 855 features a 10Gb/s Thunderbolt interface, capable of blazing-fast file transfers. The drive is housed in a sleek, aluminium-alloy enclosure designed to tastefully complement your Mac's simple, clean lines. In addition, the inner SSD is removable for more versatile use based on your preferences. 

Expand storage in a flash 
Upgrading your Mac with a Transcend JetDrive 850 allows you to increase storage capacity to 960GB, ensuring you have plenty of space for your documents, photos, music, and videos. 

Feel the need for speed
Transcend's JetDrive 850 utilizes the PCIe Gen3 x4 interface paired with the latest 3D NAND flash, resulting in a compelling performance of up to 1,600MB/s read and 1,400MB/s write*. Transcend's JetDrive 850 gives you fluid, real-time performance for demanding professional tasks, video editing, or 3D graphics rendering. 
*Note: Performance tested with AJA v1.0 / Black Magic v3.1. 

Gen3 x4
Read up to 1,600MB/s 
Write up to 1,400MB/s

Gen2 x4
Read up to 1,500MB/s 
Write up to 1,200MB/s

JetDrive Toolbox 
Exclusively developed by Transcend, JetDrive Toolbox helps maintain a healthy and efficient SSD by keeping it up-to-date, preventing functional degradation, and predicting problems before they happen. JetDrive Toolbox clearly displays drive information, S.M.A.R.T. status for possible drive failure, health indicators for estimated lifespan, and facilitates firmware upgrades. It can also identify your Mac model to quickly find out which of our Apple product suits your computer. 

All the tools you need
JetDrive 855 Thunderbolt PCIe portable SSD
Screwdrivers (T5 & P5)Rubber feet

Upgrading a Mac Pro or Mac mini requires additional screwdrivers.

The JetDrive 855 is only compatible with devices running macOS High Sierra (10.13) or later. Please upgrade your macOS to High Sierra (10.13) before the installation.


Memory Type(s)3D NAND Flash
Drive Capacity960GB
Compatible WithMacBook Air 7,1/6,1/6,2/7,2 MacBook Pro 11,1/12,1 11,2/11,3/11,4/11,5 Mac mini 7,1 Mac Pro 6,1
Interface(s)1 x Thunderbolt 10Gb/s
System Requirements
Operating Systems SupportedmacOS High Sierra (10.13) or later
Form FactorPortable
Pack Quantity1
Enclosure typeExternal
Case ColourSilver
Read Speed1600MB/s
Write Speed1400MB/s
Certification(s)CE FCC BSMI
Operating TemperatureOperating Temperature 0C to 60C
Storage TemperatureStorage Temperature -40 to 85C