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Hello dear members of the MEDION community!

A few days ago I received an e-mail from my NAS P89654 (MD 90224) with the following message:

A failure was detected on your MEDION® LifeCloud® RAID Array.
Please visit the Preferences section.

Actually only one of the two Toshiba hard drives was detected in the settings. After a reboot, the faulty hard drive will be detected again and during the RAID I recovery process, the faulty hard drive will eventually disappear from the Disk Management and only the working hard drive will be detected.

Before the healthy hard disk also stops working, I wanted to replace the defective hard disk with a new identical Toshiba MD04ACA400.

Before I order and install a new hard disk, is there anything I should consider?

1. doesn't the hard disk need to be formatted to be recognized?

2. how do I recognize in the rack which hard disk is N°1 and which is N°2? According to the LED (second LED is red) the hard disk N°2 should be defective.

Thanks in advance for any help, because I have checked all forums and found no thread which could fit my problem.