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Archived: Upgrading CVS File System from FAT to the Reliance File System

This document has been archived and is no longer updated by National Instruments

Hardware: Image Acquisition (IMAQ)>>CVS

What is the Reliance File System? What are its advantages over the FAT File System? How do I upgrade the Compact Vision System (CVS) to use it?

What is the Reliance File System?

Reliance is a transactional file system, developed by Datalight, which is tolerant to crashes and power interruptions. Before LabVIEW Real-Time 8.6, the CVS could only use a flash drive running the FAT file system. This storage solution is prone to data corruption or loss whenever a crash or power interruption occurs. In order to remedy this situation, the CVS can now use the Reliance file system.

How can I upgrade my CVS?

The Reliance file system option is installed with LabVIEW Real-Time 8.6. Before you can upgrade your file system, you need to install a new BIOS version on your CVS. Vision Acquisition Software 8.6 ships with a new BIOS for the CVS, version 13.1, which adds support for the following features:

  • Reliance file system
  • Auto-IP network configuration
  • Flash sizes larger than 1 GB
Before starting the upgrade process, the CVS must be formatted in Measurement and Automation Explorer.

Follow this procedure to format the CVS in Measurement and Automation Explorer:

Step 1: Formatting the CVS

  1. Boot into safe mode, ensuring the safe mode dip switch is on.
  2. Open Measurement & Automation Explorer (MAX) and expand Remote Systems.
  3. Select the CVS target you want to update.
  4. Right click the CVS target and select Format to format the target.

  5. Once the format is complete, boot into normal mode, ensuring the safe mode dip switch is on.
Follow this procedure to upgrade:

Step 2: Upgrade the CVS BIOS

  1. Boot into normal mode, ensuring the safe mode dip switch is off.
  2. Open Measurement & Automation Explorer (MAX) and expand Remote Systems
  3. Select the CVS target you want to update and select the Software tree item
  4. Right-click the Add/Remove Software menu item
  5. In the LabVIEW Real-Time Software Wizard, click the Update BIOS... button.
  6. Verify that the CVS is indeed in normal mode as instructed by the dialogue box, shown below.
  7. Follow the instructions to complete the BIOS update

At this point the CVS will reboot with a default name, such as NI-NI1450Series-00xxxxxx and a default network address. The CVS will still be using the FAT file system.

Step 3: Upgrading the file system from FAT to Reliance

  1. Boot into safe mode by enabling safe mode DIP switch
  2. Open MAX and expand Remote Systems
  3. Right-click the CVS target you want to format and click the Format Disk menu item
  4. Select the Reliance (recommended) radio item and click the Format button
    • WARNING: Format will erase all data currently stored on the disk
  5. Follow the instructions to complete the disk format

At this point the CVS is formatted to support the Reliance file system. You can now install LabVIEW Real-Time 8.6 and the necessary drivers for your application. 


  • When formatting, the file system option (Reliance or FAT) will only be displayed if LabVIEW Real-Time 8.6 or later is installed on your host computer. If an older version of LabVIEW RT is installed on the host, then MAX will always format the CVS with a FAT file system without offering the Reliance option.
  • Downgrading a CVS with Reliance file system from LabVIEW RT 8.6 to an earlier version does not work. Older versions of LabVIEW RT do not support accessing the Reliance file system and the CVS will hang on boot. In order to use the CVS with an older version of LabVIEW RT, boot into safe mode and format the disk with the FAT file system before attempting to use it with the older version of LabVIEW RT.
  • The CVS no longer verifies the non-volatile storage on boot-up. With the FAT file system, the CVS performs storage maintenance when booting up. With the Reliance file system, the CVS no longer performs this check on boot-up. The file system integrity is maintained by Reliance. Users will no longer see maintenance messages similar to Verifying non-volatile storage: Drive C: Cleared 1 lost clusters.
  • If the same image file is read by two IMAQ ReadFile VIs in parallel, one or both of them will fail with any of the following errors.
    - File I/O error -1074396159
    - File not found -1074395995
    - Invalid Parameters

Related Links:
Vision Support: Vision Acquisition Software


Report Date: 11/12/2008
Last Updated: 04/25/2016
Document ID: 4RBC7Q1S

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