Acer AR380 F1 - Manual (Page 49)

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Determining drive status
Each HDD carrier features two status LED indicators (see page 5) to
display the hard drive status. If you are replacing a failed HDD,
determine which drive has failed by checking the hot-plug HDD status
indicators.
3.5” HDD
2.5” HDD
Description
Onboard SATA RAID Green Red
HDD present no access Off Off