SD Card Archives

Overview

This section explains the SD Card Archive that is prepared by default in the file system.

Specifications

Basic SD Card archive operations are shown below.

• Uses the system-reserved archive name sdmc.
• Mounted automatically the first time the FS_InitFatDriver function is called.
  The types and number of NAND archives that are mounted are determined by the system launcher based on the settings in the RSF file, and are decided on during a boot.
• Because any file or directory can be created or deleted, this does not support commands that require file IDs or directory IDs. (FS_RESULT_UNSUPPORTED will be returned if such functions are called.)
• If either the buffer address or the transfer size is not aligned to a 32-byte boundary, the asynchronous read/write functions behave like the synchronous versions of the functions if called. When this is the case, processing performance declines because data is sent via a temporary buffer inside the library.

Implementation

Because the memory space within SD Cards is not in NitroROM format, the internal implementation of archives does not use the sort of procedure mechanism used for ROM archives. As a result, it supports several new functions that did not exist in NITRO-SDK. On the other hand, it does not support several existing functions. The FS functions that can be used with SD Card archives are shown below.

See Also

FS_Init

Revision History

2009/02/27 Corrected the text regarding the behavior of asynchronous functions.
2008/07/14 Made slight revision to text regarding archive name.
2007/09/26 Initial version.

CONFIDENTIAL