The SD card is divided in to 9 partitions as below:- Drive C - 14MbDrive D - 248MbDrive E - 248MbDrive F - 248MbDrive G - 248MbDrive H - 248MbDrive I - 248MbDrive J - 248MbDrive K - 135Mb All partitions are readable on a Windows or Mac operating system as well as the Atari ST GEM environment making for a perfect solution when transferring Atari ST files from your PC to the Atari ST. listing includes:1 pcs 2 gb microSD card with SD adapter This SD card is MS-DOS (FAT16)/ATARI TOS ASCI partitioned so is readable on modern computers as well as the Atari ST running a SatanDisk, UltraSatan or similar SD card based hard drive emulation hardware. ATARI ST BOOTABLE 2Gb SATANDISK ULTRASATAN SD CARD ASCI TOS DOS PC MAC EMULATOR Hard drive bootable read/writable SD card for your Atari ST's SatanDisk, UltraSatan and similar with auto boot hard drive drivers installed on the first partition. Item: 333883013796 ATARI ST BOOTABLE 2GB SATANDISK ULTRASATAN SD CARD ASCI TOS DOS PC MAC EMULATOR.