MAC OS X error connecting PCA10028 and PCA10031 JLINK DISK.

Question

Hello Nordic guys, help requested !!! 
 Error while connecting to USB port the new development boards, DK and DONGLE. 
 Error is " OS X unable to repair JLINK disk ".
 Action required : reformat disk . 
 Unable to write on this disk or copy a file (.bin .hex) 
 Is it safe to format the disk or there is a risk to damage the board ? 
 If you can not write to the disk, how do you copy the .bin file and change from mbed to JLINK and vice versa? 
 Jlinkexe from terminal runs. 
 SEGGER J-Link Commander V4.94c ('?' for help)
Compiled Oct 31 2014 20:08:55
DLL version V4.94c, compiled Oct 31 2014 20:08:48
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Sep 18 2014 11:53:15
Hardware: V1.00
S/N: *********** 
VTarget = 3.300V
Info: TotalIRLen = ?, IRPrint = 0x..000000000000000000000000
Info: TotalIRLen = ?, IRPrint = 0x..000000000000000000000000
No devices found on JTAG chain. Trying to find device on SWD.
Info: Found SWD-DP with ID 0x*********
Info: Found Cortex-M0 r0p0, Little endian.
Info: FPUnit: 4 code (BP) slots and 0 literal slots
Cortex-M0 identified.
Target interface speed: 100 kHz
 
 Thanks, 
 -c

RK · Accepted Answer

This is a known issue with the MBED driver which is already being looked at ( github.com/.../69) . There's a workaround on that thread, but it's not awfully stable. 
 I also reported it to Nordic last week and they're looking at it and so is Segger. It's going to need a new build of the firmwares (both MBED and Segger) when the patch is done. 
 As for the rest of your questions - since the board comes with JLink OB on it and that works fine with JLink in the same way the previous eval and dev boards did, you can continue to work that way, just unmount the drive and ignore it. If you really want to use MBED then use a windows box to put the firmware on and use the workaround to remount the drive and copy your .bin file to it. I really wouldn't though, I'd stick with the JLink debugging, it's way better anyway. 
 Update 26 November 2014 
 The latest beta from Segger (V4.95c) contains new firmware. Just running JLinkExe with the usual arguments should update your board to it. The JLINK partition now mounts correctly, not that I've tried using it. Currently however if you boot with the BOOT/RESET key held down to get the BOOTLOADER partition, that still fails in the same way. I've reported that to the person at Nordic who's been helping me and hopefully that will get back to Segger. 
 Still waiting on MBED to apply the patch and release, but at least with the latest from Segger you can JLink Debug (as you could before) but without OSX moaning and complaining every time you plug the board in. I assume dumping a .bin file on the JLINK partition will also flash the chip but I'm rather too scared to find out.

MAC OS X error connecting PCA10028 and PCA10031 JLINK DISK.

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