Solution:

Ultra ATA/66 is the newest EIDE hard drive interface that allows host computers to send and receive data at 66.6 MB/s. Some BIOS versions have potential issues with Ultra ATA/66 that can lead to data corruption. Western Digital hard drives with Ultra ATA/66 capabilities are now shipped with this feature enabled. WDATA66 is a hard drive utility designed to enable or disable the Ultra/66 capability on Western Digital hard drives that support Ultra ATA/66. ------- from Western Digital's web Please link to Western Digital's web to download the utility and disable Ultra ATA/66 capability to solve this issue. This record is written for your information only. Such phenomena may not happen with Advantech's products.