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7KDAB, Version 2.0, 19-Aug-2007
Vyex LLC, 2003-2007
11
File system requirements
The Multi-Media Card needs to be formatted with a DOS FAT16 file format. For smaller media types, the default of the
format program you utilize may format the card with a FAT12 file system, and you will need to override the default
settings.
Example:
To format a 16MB card under Windows 2000, open a Command Prompt Window and type:
FORMAT d: /a:1024
Where ‘d’ equals the drive letter corresponding to the MMC card, and 1024 equals the size, in bytes, of each cluster.
You will be prompted:
Insert new disk for drive d:
and press ENTER when ready...
Hit [Enter] to continue.
The type of the file system is FAT.
Verifying 15M
Initializing the File Allocation Table (FAT)...
Volume label (11 characters, ENTER for none)?
Hit [Enter] to continue.
Format complete.
15,960,064 bytes total disk space.
15,960,064 bytes available on disk.
1,024 bytes in each allocation unit.
15,586 allocation units available on disk.
16 bits in each FAT entry.
Volume Serial Number is 10D5-D722
The key thing here is to select a cluster size for the disk that results in the format program showing a summary of “16 bits
in each FAT entry.”.
The most efficient disk utilization will generally be realized when the smallest possible cluster size is selected, however
other factors, such as the increase in the FAT table size may offset any gains that may occur through any increase in disk
utilization efficiency.