DIY USB Drive Project with Phison L95B & IS903

If you're interested in DIY USB drives, take a look at this article.

If you have two Phison L95B chips, each 64GB (128GB in total), the capacity might be too small for an SSD. If you're planning to use an IS903 controller, but all your IS903 chips are 3.3VCCIO while the L95B's IO voltage is 1.8V, and you don't want to buy a new controller board, you can design your own 1.8VCCIO voltage controller board. The IS903 supports two LEDs, plus a write protection indicator, giving you a total of three LEDs that you can use with RGB LEDs for testing.

Here's the front of the board:

The back:

Board layout:

After soldering all components, except the flash memory, here's the front:

And the back:

Here's the board after powering up:

You will still need to solder the FLASH memory, and don't forget to create a matching case.

For normal read/write, the LED will be green. In 2.0 mode, it will be blue, and the write protection LED will be red. For 3.0 read/write, it's green, and the idle state will show a breathing light.

Here's the normal read/write state:

In 2.0 mode, the LED has a cool blue effect:

And here's the 3.0 write protection state:

Done!