Sd Card Registers In Spi Mode; Data Interchange Format And Card Sizes - SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Product Manual

SD Card Interface Description

3.5.8. 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:
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.
Capacity Total
LBAs
16 MB 28,800
32 MB 59,776
64 MB 121,856
128 MB 246,016
256 MB 494,080
512 MB 990,864
1024 MB 1,983,744
Capacity Total
LBAs
16 MB
32 MB
64 MB 1,376
128 MB 2,624
256 MB 5376
512 MB 10,240
1024 MB 20,480
3-24
Table 3-30. Parameters for User Area DOS Image
No. of Partition
Sys. Area Sectors
39
45
57
95
155
275
519
Table 3-31. Parameters for Protected Area DOS Image
No. of Partition
Sys. Area Sectors
352 35
736 37
37
35
37
37
37
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
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
Total Partition User Data
Sectors Sectors
351 316
733 696
1,373 1,336
2,611 2,576
5365 5328
10,213 10,176
20,421 20,384
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
User Data
Bytes
161,792
356,352
684,032
1,318,912
2,727,936
5,210,112
10,436,608