Data Interchange Format And Card Sizes - SanDisk SDSDB-016G-A11 Product Manual

Revision 2.2
3.5.7 SD Card Registers in SPI Mode
In SPI mode, all the card's registers are accessible. Their format is identical to the format in
the SD Card mode. However, a few fields are irrelevant in SPI mode. In SPI mode, the card
status register has a different, shorter, format as well. Refer to the SPI Protocol section for
more details.
3.6

Data Interchange Format and Card Sizes

In general, 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 SD Card. In general, each SD Card is divided into two
separate DOS-formatted partitions as follows:
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 3-31 and 3-32 describe the user and protected areas for all SanDisk
SD Cards.
Table 3-31
Capacity
16 MB
32 MB
64 MB
128 MB
256 MB
512 MB
1 GB
2 GB
Table 3-32
Capacity
16 MB
32 MB
64 MB
128 MB
256 MB
© 2004 SanDisk Corporation
User Area DOS Image Parameters
Total Number of
LBAs Partition
System Area
Sectors
28,800 39
59,776 45
121,856 57
246,016 95
494,080 155
990,976 275
1,984,000 519
3,917,072 519
Protected Area DOS Image Parameters
Total Number of
LBAs Partition
System Area
Sectors
352 35
736 37
1,376 37
2,624 35
5,376 37
3-23
Chapter 3 – SD Card Interface Description
SD Card Product Manual
Total Partition User Data
Sectors Sectors
28,743 28,704
59,725 59,680
121,817 121,760
245,919 245,824
493,979 493,824
990,627 990,352
1,983,495 1,982,976
3,967,239 3,966,720
Total Partition User Data
Sectors Sectors
351 316
733 696
1,373 1,336
2,611 2,576
5,365 5,328
User Data
Bytes
14,696,448
30,556,160
62,341,120
125,861,888
252,837,888
507,060,224
1,015,283,712
2,030,960,640
User Data
Bytes
161,792
356,352
684,032
1,318,912
2,727,936
12/08/04