Mass storage with nRF51?

[Sensors]

I have a project that requires a bluetooth central to be used to gather data from a HRM service, which shouldn't be too much of an issue. However, it also has to store this, and other local sensor data to some sort of storage device (perhaps microSD or Flash memory).

I want to be able to access this data from a PC or other device, but I'm not sure if the nRF51 or nRF52 has the ability to support a file system and act as a USB mass storage device. Would I need to use an additional part to make this possible? If so, what options do I have?

Thanks

[RK]

In that case you don't need an SD card and all the expense of the holder if you're not going to take it out again. Just use some cheap SPI addressed soldered in flash memory, cheaper, easier.

If you must have USB then buy a USB capable interface chip, I'm sure FTDI does them, Atmel does them, there's bound to be lots of others, probably come ready-configured to look like serial ports or MSDs and you just need to feed them, probably via SPI again.