Hitachi HF-W7500 65 Instruction Manual page 258

(22) HDD or SSD rebuild occurs.
<Possible cause>
If there is no response from the HDD or SSD above a certain level and the timing of the
system power off overlaps, rebuilding may occur in rare cases even if the HDD or SSD is not
replaced.
<Action>
1. There is no problem if the rebuild is completed normally due to a transient failure.
2. If it occurs repeatedly or if an HDD or SSD error is detected in the hardware status display
window, it is considered a drive failure and it is recommended to back up the HDD or SSD
data and replace the HDD or SSD.
9-19
9. TROUBLE SHOOTING