SanDisk 41DVN User Manual

SanDisk 4.0GB CompactFlash  
Card Quick Start Guide  
Introduction  
How do I change switch positions?  
This is a user guide for the SanDisk 4.0GB  
CompactFlash Card.  
To change switch positions, simply use a slim instrument  
or even your fingernail to move the switch into the desired  
position.  
Understanding the “Switch-able”  
SanDisk 4.0GB CompactFlash Card  
What is a FAT?  
Switch  
FAT16  
---  
2.0GB  
2.0GB  
FAT32  
4.0GB  
2.0GB  
2.0GB  
1
2
3
FAT stands for File Allocation Table. A file allocation table  
is used by a particular file system to link addressable  
chunks of the storage media (known as clusters) to partic-  
ular files. Under Windows operating system, there are  
three popular types of FATs (FAT12, FAT16, and FAT32),  
the difference being how many bits are used to address  
clusters. Associated with each type of FAT is a data struc-  
ture called the Directory that stores file names, sizes,  
modification information, etc.  
For cameras and devices that can only use FAT16 you  
need to use the 2nd and 3rd positions. (Consult your  
device user guide or contact the device manufacturer if  
you are not sure if your device can use only FAT16)  
Position 1 allows you to use the whole 4.0GB of space but  
it is formatted as FAT32. Only devices that use FAT32 can  
access card in this position  
What is the difference between FAT16 and FAT32  
formats?  
Position 2 allows you to use the 1st 2.0GB of space  
Position 3 allows you to use the 2nd 2.0GB of space  
The FAT16 format uses a 16-bit and FAT32 uses a 32-bit  
number to point to where the clusters of a file are stored.  
FAT32 was introduced by Microsoft to circumvent the  
2.0GB card capacity limit and allow access to storage  
media up to several Terabytes. In addition, the directory  
structure of FAT32 increases the maximum number of files  
that can be stored on the media from that of FAT16.  
FAQs  
What happens to my files when I switch to position #1  
(4.0GB) from position #2 or #3?  
Why do FAT16 and FAT32 formats affect my use of  
the 4.0GB CompactFlash card?  
When you switch to position #1 all data on the card may  
be lost. Even if the data is not deleted, it will not be view-  
able in position #1. Please save data to a PC before  
switching to position # 1.  
FAT16 enabled devices limit your CompactFlash card’s  
capacity to 2.0GB or less. To allow you to use the 4.0GB  
card in a FAT16 device we have created the ability to  
switch the card between two, 2.0GB partitions as well as  
a single 4.0GB partition. FAT16 devices cannot use  
CompactFlash cards formatted as FAT32. FAT32 allows  
you to store data more effectively.  
What happens to my files when I switch between posi-  
tions #2 and #3?  
You may switch between positions #2 and #3 without los-  
ing data. You can use the two separate 2.0GB partitions to  
store different types of data or to allow you to store 4.0GB  
of data using a FAT16 device.  
The SanDisk 4.0GB CompactFlash Card  
Switch  
Where is it located on the card?  
My CompactFlash card no longer works in my FAT16  
device after formatting it on Windows XP. Why?  
Windows XP formats cards 64MB and higher as FAT32 by  
default. Format the card again and make sure to choose  
FAT16.  
The switch is located on the lower left-hand area of the  
card if you are looking at the back label.  
Position #3 = 2.0GB  
Position #2 = 2.0GB  
Position #1 = 4.0GB  
80-36-00312  

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