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Sony Microvault USB Flash Drive for Smartphone Review

_DSC9128I was originally just planning to get an SD card reader with OTG cable, to enable me to easily transfer photos into and out of my Nexus 7 tablet. Then at a computer store, I saw the Sony Microvault USB Flash Drive for Smartphone, which is basically a USB flash drive that includes a micro USB OTG connector. This seems useful too.

Let me talk about the OTG bit for a moment. Every knows about USB flash drives, or thumb drives. You connect them to a computer, and they appear like extra disks for storing files. The computer is the USB host, and the flash drive is the USB device.

OTG enables devices to reverse their roles. So, for example, while a smartphone or tablet is usually a USB device which connects to a USB host computer, the device can become a USB host and talk to other USB devices. Many Android smartphones support OTG functionality, enabling them to connect to other USB devices.

Physically, the USB OTG devices still use micro USB port. However, with a suitable OTG cable, one end has a micro USB B plug that connects to the USB OTG device, and the other end usually has a USB A socket, the standard kind you find on a computer. Into this socket, you can plug in any USB device.

The Sony Microvault USB Flash Drive for Smartphone, or USM-SA1, is a flash drive with the OTG connection built into it. On the one end is a standard USB A port which you can plug into a regular USB port on a computer, while on the other end, there is a micro USB B plug which connects into a smartphone or tablet that supports OTG.


The USM-SA1 is small and compact. I know that some USB storage gadgets can get even smaller, but I reckon this one is just the right size to not easily get lost.

There is a lockable rotating cap which covers the micro USB end of the USM-SA1. The cap is attached with a plastic strap, so it will not go missing. In addition, a strap hole on the cap lets you tie the USM-SA1 to your key chain or something else.

The USM-SA1 is still a regular flash drive, so you can just plug it into a computer and start using it. No need for drivers and such. On the OTG side, you just plug it into an OTG capable smartphone or tablet. Sony does provide a file manager app, which does not support Android 4.4. Instead, I used the Nexus Media Importer. (The app does cost a few dollars.)

I must stress that the OTG function is a feature of the smartphone or tablet. You need a gadget that supports OTG. Many new Android smartphones and tablets do, but be sure to check that out first.

Read/write speeds on the USM-SA1 is average. In the Blackmagic Disk Speed test, it scores 8MB/s writes and 24MB/s reads.


The Sony Microvault USB Flash Drive for Smartphone is a very useful flash drive particularly if you want to use it with smartphones and tablets.


  • Small and compact size
  • Cap has attached strap
  • Micro USB OTG connector for smartphones and tablets


  • Included file manager app does not support Android 4.4

2 thoughts on “Sony Microvault USB Flash Drive for Smartphone Review

  1. Hi, May I know which Nexus 7 do you have?
    I have the old one, and recently just bought the same Sony OTG but in 32GB.
    I can’t seem to get it to work. I’ve installed the sony file manager app, and it launches automatically when I connect the OTG, but it does not appear in the file manager as a storage location.
    Any advice?

    1. Hi Tim. I have the 2013, i.e. 2nd gen. I used Nexus Media Importer. It’s a paid app, but they have a free companion, Nexus Photo Viewer, which can be used to see if the OTG will work.

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