IMPORTANT: DO NOT USE THE K64F WITH WINDOWS™ 8/10 WITH STORAGE SERVICES ENABLED! DISABLE WINDOWS™ STORAGE SERVICES ON WINDOWS™ 8/10 BEFORE PLUGGING IN K64F TO A PC!!!
Explanation: A bug in older versions of the ARM™ bootloader firmware can cause the K64F board to have corrupted flash and become unusable until a JTAG device is used to reprogram. For more info see: https://os.mbed.com/blog/entry/DAPLink-bootloader-update/
Once NXP™ version 0243 (or later) K64F firmwares (BOTH bootloader and DAPLink must be upgraded) are programmed into the K64F, it should be safe to use Windows™ 8/10 with or without Storage Services enabled.
Workarounds: 1) Do not use Windows™ 8/10 with firmware older than 0243. 2) Disable Windows™ Storage Services before plugging in the K64F board. 3) Upgrade the firmware to the latest on the NXP™ website with Windows™ 7 before using Windows™ 8/10 if you are not able or want to disable windows storage services.