UC-7400-CE User’s Manual
Introduction
1-8
Storing Data in RAM vs. Flash Memory
Although data saved in RAM will be deleted when the system shuts down, RAM storage has the
advantage of faster read/write access and no life cycle issue.
For applications where important data is transmitted immediately and directly to a host, you can
store the necessary log data in RAM. After the host receives the data, the data does not need to be
retained and can be deleted.
Embedded computers have resource limits, so integrators need to determine when it is critical that
data be stored on one of the file systems. When it is necessary for data to be stored, the appropriate
file system should be used.
Hive-Based Registry
The registry for the UC-7400-CE is a hive-based registry, instead of a RAM-based registry. The
hive-based registry stores registry data inside files, or hives, which can be kept on any file system.
This removes the need for performing backup and restore on power off.
Inserting a CompactFlash Card
The UC-7400-CE (except for the UC-7410-CE) is equipped with a type II CompactFlash slot that
supports cards of both types I and II. Since mass storage cards are considered to be standard
attachments, when an empty mass storage card is inserted in the slot, the computer automatically
formats it in FAT format. Note that the formatting process takes a few minutes to complete. When
a mass storage card is inserted, the UC-7400-CE creates a directory named “CFFloder” under the
root directory. For programming purposes, use “CFFloder” to link to the directory.
The following CompactFlash products have been verified compatible with the embedded
computer:
Manufacturer Size
Speed
PRETEC 128
MB
SanDisk Ultra II
1 GB
Transcend 2
GB
45X
Transcend 2
GB
80X
Transcend 4
GB
80X
ATTENTION
If your CompactFlash card is not detected when the system boots up, try the following:
(a) Remove the CompactFlash card and insert it again.
(b) Turn the embedded computer off and turn it on again.
Installing a USB Mass Storage Device
When an empty USB drive is installed on the UC-7420-CE, it will automatically be formatted
using the FAT file system rather than the TFAT system. This is because USB drives are most often
used to share data with PCs.
Each USB drive will appear as a directory under the root directory, with the first device named
“USBDisk” and the second device named “USBDisk2”.
The following USB drives have been verified compatible with the embedded computer:
