Reasons of disk corrosion

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Disks are integrated electronic mechanical devices. They have printed circuit boards (PCBs) which easily corrode in the corrosive environment. (Similar electronic devices have the same corrosion risk).

Other related questions:
Ideal environments to prevent disk corrosion
Disks need to run in environments meeting the following requirements: 1. The corrosion rate of the copper test wafer is lower than 300 ? per month in compliance with ANSIc/ISAd-71.04 environmental corrosion G1 level. 2. The corrosion rate of the silver test wafer is lower than 200 ? per month in compliance with ANSIc/ISAd-71.04 environmental corrosion G1 level. If disks run in environments whose corrosion level is worse than G1, disks may corrode. Environment requirements for normal disk running have been described in the product documentation.

Reason why the disk fault indicator is not on when the disk is faulty
The storage disk has the physical status and logical status. The physical status can be considered as the physical feature status of the disk. Therefore, you are advised to replace the disk when a physical fault occurs. The logical status is assigned by the software. In some cases, the disk can still be used when a logical fault occurs. When the I/O of the disk fails, the logic is faulty. If a disk is physically faulty, the logic is also faulty. The software turns on the fault indicator. Because the disk cannot be used, the disk fault indicator is on and prompts you to replace the disk. The logic of a disk is faulty, but the physical status may not be faulty. In some cases, the disk can still be used. Therefore, the disk fault indicator is not turned on.

Full disk scanning for hard disks of the USG6000 series
Disks may be bumped during delivery, which may cause disk failures. Before usage, you can perform full disk scanning to repair the disks. Full disk scanning takes 2 to 3 hours. Note: Hard disk self-check interrupts hard disk services. Exercise caution when you perform full disk scanning. 1. Install the hard disk to the device. 2. In the system view, run the disk offline command to enable the hard disk to go offline. 3. In the diagnose view, run the disk self-test enable command to perform full disk scanning. 4. In the diagnose view, run the display disk self-test command to view the result of disk self-check. Progress: displays the progress. For example, in 2/46, 46 indicates that the operation may take 46 minutes, and 2 indicates that 2 minutes have elapsed. The actual time taken shall no longer than 46 minutes. Otherwise, the disk is faulty. ErrorType: Selftest complete without error: indicates that the hard disk is not faulty. Send command failed!: indicates that you shall run the self-check command again. Other: indicates that the hard disk is faulty, and you need to replace it or contact professionals for analysis. DiskSN: indicates the SN of the current hard disk. The self-check result corresponds to the SN.

What are the gaseous corrosivity levels
According to ANSI/ISA-71.04-2013 Environmental Conditions for Process Measurement and Control Systems: Airborne Contaminants, the gaseous corrosivity levels are G1 (mild), G2 (moderate), G3 (harsh), and GX (severe)

Environmental corrosion level requirements of storage products
1. The corrosion rate of the copper test wafer is lower than 300 ?b per month in compliance with ANSIc/ISAd-71.04 environmental corrosion G1 level. 2. The corrosion rate of the silver test wafer is lower than 200 ? per month in compliance with ANSIc/ISAd-71.04 environmental corrosion G1 level. You are advised to ask a professional organization to monitor environmental corrosion levels in the equipment room.

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