SanDisk SD064 manual SanDisk SD-ROM Card Specifications, Operating Specifications, Memory Capacity

3 SanDisk SD-ROM Card Specifications

3.1 Operating Specifications

The table below summarizes the SD-ROM operating specifications.

Parameter		Value		Notes
Supply Voltage		2.0 – 3.6v		during card identification for version 1.1 cards
		2.7 – 3.6v		all supported commands
Operating Temperature		-25 – 85 °C
Storage Temperature		-40 – 85 °C
Data Retention		100 years minimum
Data Endurance	1x109 read cycles
Interface speed		0 – 25MHz		variable clock rate
Read Bandwidth	1.8MB/s minimum		sequential read, 25MHz interface speed
Read Current		50mA typical
		75mA maximum		maximum at 3.6v, 85 °C
Sleep Current	250uA maximum
Reset to Read Latency		300ms
Read Command Response		100ms

3.2 Memory Capacity

SanDisk SD-ROM Cards are sold preloaded with an OEM-specified image which may or may not have a file system. In general, a file system provides structure for data; the SD Card File System Specification, published by the SDA, describes the file format system that is typically implemented on SD cards.

SanDisk SD-ROM cards do not support the SD security features (CPRM), and are therefore organized as a single non-secure partition. The content data can be accessed by the host system using standard read commands.

The following table lists the available user space for 32, 64, and 128MB cards. Note that some hosts cannot handle non-standard image sizes, so the allowable space for a particular application may be less than shown in the table.

Capacity	Maximum User LBA	Maximum User Data Image Size
32 MB	63,488	31.0MB	(32505856 bytes)
64 MB	129,024	63.0MB	(66060288 bytes)
128 MB	260,096	127.0MB	(133169152 bytes)

3.3 Register Values

The SD specifications define a set of eight registers within the card interface. However, the DSR Register is optional and is not used in the SanDisk SD Card Product Family. For specific information about all registers, refer to Section 5 of the SDA Physical Layer Specification, Version 2.00.

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