When you attempt to convert a FAT32 partition that is 60GB or larger, on a Windows 2000 or Windows XP platform that only has 64MB of memory, you receive an insufficient memory error and the conversion fails?
During this conversion, convert must allocate a 13MB volume bit map. You do not have enough memory to allocate the bit map.
NOTE: If you are running Windows XP, the conversion will fail if the drive was NOT formatted using Windows XP.
To workaround this issue, increase memory to 128MB.
NOTE: With 64MB of memory, the largest partition that can be converted is 40GB.