I could be wrong, but I think that is a hardware problem, because /dev/block/mmcblk0 is internal memory.
I hope for your help.
P.S. Sorry for my bad english.
That seems really odd.
Do you have your bootloader unlocked? If not, you may return the razr on warranty.
If it is unlocked, please give it a last try flashing my recovery from there: http://android.matthias-larisch.de/razr-i/recovery/
using fastboot flash recovery recovery.img
When that succeeds, boot into recovery (use volume down to navigate in fastboot and volume up (NOT power) to select) and try flashing your rom from zip. If that fails but recovery boot suceeds, please use adb and enter "parted /dev/block/mmcblk0 print" and post output here (maybe you should do that BEFORE trying to flash rom).
If even recovery does not flash/boot, then it really seems like a hardware error. Last try is razr i unbrick from http://forum.xda-developers.com/show....php?t=2283433 that guide although I don't think this can help.
Appreciate your feedback!