Product manual

Industrial Grade SD Card Interface Description
SanDisk Industrial Grade SD Product Manual, Rev. 1.0 © 2003 SANDISK CORPORATION -3-25
3.6. Data Interchange Format and Card Sizes
In general, Industrial Grade SD Card data is structured by means of a file system. The SD Card File System
Specification, published by the SD Association, describes the file format system that is implemented in the SanDisk
Industrial Grade SD Card. In general, each card is divided into two separate DOS-formatted partitions as follows:
• The User Area—used for secured and non-secured data storage and can be accessed by the user with
regular read/write commands.
• Security Protected Area—used by copyright protection applications to save security related data and
can be accessed by the host using the secured read/write command after doing authentication as
defined in the SD Security Specification. The security protected area size is defined by SanDisk as
approximately one percent of the total size of the card. Tables 3-30 and 3-31 describe the user and
protected areas for all SanDisk SD cards.
Table 3-30. Parameters for User Area DOS Image
Capacity Total
LBAs
No. of Partition
Sys. Area Sectors
Total Partition
Sectors
User Data
Sectors
User Data
Bytes
32 MB 59,776 45 59,725 59,680 30,556,160
64 MB 121,856 57 121,817 121,760 62,341,120
128 MB 246,016 95 245,919 245,824 125,861,888
256 MB 494,080 155 493,979 493,824 252,837,888
512 MB 990,864 275 990,627 990,352 507,060,224
1024 MB 1,983,744 519 1,983,495 1,982,976 1,015,283,712
Table 3-31. Parameters for Protected Area DOS Image
Capacity Total
LBAs
No. of Partition
Sys. Area Sectors
Total Partition
Sectors
User Data
Sectors
User Data
Bytes
32 MB 736 37 733 696 356,352
64 MB 1,376 37 1,373 1,336 684,032
128 MB 2,624 35 2,611 2,576 1,318,912
256 MB 5376 37 5365 5328 2,727,936
512 MB 10,240 37 10,213 10,176 5,210,112
1024 MB 20,480 37 20,421 20,384 10,436,608