SanDisk 4.0GB CompactFlash Card Quick Start Guide

Introduction

This is a user guide for the SanDisk 4.0GB

CompactFlash Card.

Understanding the “Switch-able” SanDisk 4.0GB CompactFlash Card

What is a FAT?

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.

What is the difference between FAT16 and FAT32 formats?

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.

Why do FAT16 and FAT32 formats affect my use of the 4.0GB CompactFlash card?

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.

The SanDisk 4.0GB CompactFlash Card Switch

Where is it located on the card?

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

How do I change switch positions?

To change switch positions, simply use a slim instrument or even your fingernail to move the switch into the desired position.

Switch

FAT16

FAT32

 

 

 

1

---

4.0GB

 

 

 

2

2.0GB

2.0GB

 

 

 

3

2.0GB

2.0GB

 

 

 

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

Position 2 allows you to use the 1st 2.0GB of space

Position 3 allows you to use the 2nd 2.0GB of space

FAQs

What happens to my files when I switch to position #1 (4.0GB) from position #2 or #3?

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.

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.

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.

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SanDisk 41DVDSN, 41DVN quick start SanDisk 4.0GB CompactFlash Card Quick Start Guide, Introduction, FAQs, FAT16 FAT32
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41DVN, 41DVDSN specifications

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