Using a BBB revision B, I’ve followed standard instructions for copying the Angstrom distro to a micro SD card from a Windows 7 machine. It works and I can boot from the SD card, I’ve done this with both 16gb & 32gb micro sd cards. First, I format the sd card so I have an empty card with a single partition of 16gb free. The problem is that after Win32DiskImager copies the img file to the card, I’m always left with an sd card that has only 70mb total space and only a few meg of available space. If I look at the sd card in Windows Computer Management, it shows the active partition of 71mb, another empty partition of 3.33gb and 12gb of unallocated space. Is there another tool besides Win32DiskImager or something else I can look at?