• info@happli.be

Transcend JetDrive Lite 360 256GB: Developer review

Transcend JetDrive Lite 360 256GB: Developer review

I’ve got a Macbook Pro that I use for developing apps cross-platform apps.  It’s a been a great tool so far. I’ve got a Windows 10 running as a Parallels VM and there are plenty tools installed on that VM. Everything that a modern .NET Developer needs (Visual Studio, Git…). I came to the point that I’m running out of free disk space on my macbook’s SSD.

So I started to look for an external storage solution.

  • I wanted something fast (I would put my VM on it)
  • I wanted a compact solution (I carry my Macbook very often, and didn’t want to have to take an external hard drive and its cable with me all the time)

I found that Transcend produces the Transcend JetDrive Lite range. These are tailor-made sd cards for Macbook. They have a specific size so that they do not protrude.

The card has a special size

Special Format

JetDrive Lite 360 256GB inserted in a Macbook Pro

JetDrive Lite 360 256GB inserted in a Macbook Pro

I went for the 360 as I own a mid 2015 Macbook Pro (you have to pick the right model depending on your Macbook). The Transcend JetDrive Lite 360 offers up to 256 GB of storage.

After plugging it into my Macbook, I copied my Parallels VM (a 140 GB .pvm file) from the Macbook SSD onto the JetDrive card. Then I started that VM from Parallels. The boot process seemed slower than from the SSD.  Then I started Visual Studio 2015, opened a solution file composed of several projects. It seemed slower to compile as well. Then, I ran a subset of the NUnit tests contained in that solution (117): it was obviously much slower.

Today, I decided to measure the time it took from the SSD and from the JetDrive Lite so that I could have a better idea of how bad that was. Nothing too scientific. It was all about deciding if I would accept working daily with that setup or if it was definitely too slow. The tasks I measured were the following:

  • compiling the solution file (mentioned above)
  • running the NUnit tests

Here are the results.


This is the time it took to rebuild the whole solution. Time was measured with BuildMonitor (a Visual Studio extension). Times are expressed as MM:SS (minutes:seconds).

  • From the Macbook’s SSD: 00:12
  • From JetDrive Lite: 01:17

The JetDrive Lite is 6 times slower at compiling the same solution.

Running NUnit tests

This is quite a big set of integration tests. They take a while to execute (I know I should work on it).

  • From the Macbook’s SSD: 03:40
  • From JetDriveLite: 07:45

The JetDrive Lite is twice as slow as the SSD at this task.

Disk access benchmark with CrystalDiskMark

Even though SSD’s are obviously faster than SD cards, I decided to benchmark the disk access just to get an order of magnitude. I used CrystalDiskMark, from the running VM (under Windows 10). Here are the benchmark results.

CrystalDiskMark benchmark of the SSDCrystalDiskMark benchmark of the SSD

CrystalDiskMark benchmark of the Macbook’s SSD

CrystalDiskMark benchmark of the JetDrive Lite

CrystalDiskMark benchmark of the JetDrive Lite

The JetDrive Lite 360 is a lot slower at writing than its SSD rival.


Even though Transcend doesn’t recommend installing an OS on its JetDrive Lite, I gave it a try in the context of a VM. I wanted to try the SD card solution, even though SSD’s are obviously faster than SD cards, because the option wasn’t too expensive. Still I’m bit disappointed. I think this could be a good solution for some kind of permanent storage, but not for running resource consuming tasks.

I’m still stuck with the same problem of insufficient disk space on my Mac. I’ll have to try different strategies. I’m thinking of:

  • reducing the SmartGuard snapshots retention
  • having a separate virtual Hard Drive (stored on the JetDrive) for my Windows 10 VM and reinstalling dev environments on that separate Hard Drive
  • resorting to using a USB 3 external hard drive that I would have to carry.

Leave your message