I have the 32G flash drive. I tried to follow the instructions on Windows 7, but it will not allow me to create the second partition. I researched it and it seems that windows 7 thinking USB drive is removable, not allow creating another partition on it. There is work around to change the driver, and I guess Windows 10 and later it is not a problem anymore.
I found out it is much easier to do it from command line on Apple Mac, using "diskutil"
Xins-MacBook-Pro
ownloads xwang$ diskutil list
/dev/disk0 (internal, physical):
....
/dev/disk1 (internal, virtual):
....
/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *31.4 GB disk2
1: Microsoft Basic Data TESLA 31.4 GB disk2s1
Xins-MacBook-Pro
ownloads xwang$ sudo diskutil partitionDisk disk2 2 MBR MS-DOS TESLACAM 16G MS-DOS MUSIC R
Password:
Started partitioning on disk2
Unmounting disk
Creating the partition map
Waiting for partitions to activate
Formatting disk2s1 as MS-DOS (FAT) with name TESLACAM
512 bytes per physical sector
/dev/rdisk2s1: 31219472 sectors in 1951217 FAT32 clusters (8192 bytes/cluster)
bps=512 spc=16 res=32 nft=2 mid=0xf8 spt=32 hds=255 hid=2 drv=0x80 bsec=31250000 bspf=15244 rdcl=2 infs=1 bkbs=6
Mounting disk
Formatting disk2s2 as MS-DOS (FAT) with name MUSIC
512 bytes per physical sector
/dev/rdisk2s2: 30062288 sectors in 1878893 FAT32 clusters (8192 bytes/cluster)
bps=512 spc=16 res=32 nft=2 mid=0xf8 spt=32 hds=255 hid=31250003 drv=0x80 bsec=30091693 bspf=14679 rdcl=2 infs=1 bkbs=6
Mounting disk
Finished partitioning on disk2
/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *31.4 GB disk2
1: DOS_FAT_32 TESLACAM 16.0 GB disk2s1
2: DOS_FAT_32 MUSIC 15.4 GB disk2s2
This will wipe out everything from the drive and you need to start over by create "TeslaCam" directory on first partition, and copy music files to the second partition.