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3-25 SanDisk miniSD Card Product Manual, Rev. 1.1 © 2003 SANDISK CORPORATION
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 miniSD 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, the miniSD Card data is structured by means of a file system. The miniSD Card File System
Specification, published by the SD Association, describes the file format system that is implemented in the SanDisk
miniSD Card. In general, each miniSD 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 3-29 and 3-30 describe the user and
protected areas for all SanDisk miniSD Cards.
Table 3-29. Parameters for User Area DOS Image
Capacity Total
LBAs
No. of Partition
Sys. Area Sectors
Total Partition
Sectors
User Data
Sectors
User Data
Bytes
16 MB 28,800 39 28,743 28,704 14,696,448
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
Table 3-30. Parameters for Protected Area DOS
Capacity Total
LBAs
No. of Partition
Sys. Area Sectors
Total Partition
Sectors
User Data
Sectors
User Data
Bytes
16 MB 352 35 351 316 161,792
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
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