User's Manual

36
8700 Series Mobile Computer Reference Manual
1.8 SD CARD
A SD card i nserted in t he mobil e c omputer is direct ly acc essible for user’s applications.
Yet when the mobile c omputer connects to the host computer via a USB cable, the SD
card can work as a removable disk (USB mass storage device) as long as it is configured
properly through programming or via System Menu | 8. Next Page | 1. SD Card
Menu | 1. Run As USB Disk. Refer to
3.8 SD Card Menu
.
Note: While running BASIC application, the size of DAT files on SD card can be calibrated.
Go to System Menu | 8. Next Page | 1. SD Card Menu | 2. Access SD Card | 4.
Check File Size to refresh the size of “A:\BASICRUN\TXACTn.DAT” (n=1~6).
1.8.1 FILE SYSTEM
For 8700 Series, SD cards of FAT12/FAT16/FAT32 file systems are sup ported and card
formatting through C programming or via System Menu | 8. Next Page | 1. SD Card
Menu | 2. Access SD Card is supported. Based on the capacity of the car d, it will
automatically decide the FAT format:
Card Capacity
FAT Format Sectors per Cluster
> 8 GB
FAT32 16
≦ 32 MB
FAT12 32
≦ 1 GB
FAT16 32
≦ 2 GB
FAT16 64
≦ 8 GB
FAT32 8
1.8.2 DIRECTORY
Unlike the file system on SRAM , the file system on SD ca rd suppor ts hierarchical tree
directory structure and allows creating sub-d irectories. Seve ral directories are reserved
for particular use.
Reserved Directory
Related Application or Function Remark
\Program
 System Menu | Load Program
 Program Manager | Download
 Program Manager | Activate
 Kernel Menu | Kernel Update
 UPDATE_BASIC()
This di rectory stores the programs t hat are
downloadable to the mobile computer:
 C program — *.SHX
 BASIC program — *.INI and *.SYN
\BasicRun BASIC Runtime This directory stores the DAT and DBF fil es
that are cr eated an d accessed i n BASIC
runtime.
They are assi gned the permanent filenames
as follows: