I’m going to try and make this simple but it’s not.
OK, my tower is an old Mac Pro (2010, 2 x 2.66 GHz 6-Core Intel Xeon, running 10.13.6). For this story I’ll call the four drives in my DR04DD, top to bottom, 1, 2, 3 and 4.
It’s 2014 and my DR04DD has 4 2TB drives and is working fine. One day I see the top drive, drive 1 shows a red light. I eject the drive but realize it’ll be days before I can get a replacement. I reseat the drive. Lo and behold, it starts rebuilding. After a couple of weeks, it seems to be back! All is good. I’m using my Drobo again.
A year later drive 4 shows a red light. After my experience with 1, I decide to eject and reseat. All lights go red. I unplug the Drobo, change jobs, move, change my life, forget about the Drobo.
Recently, I’m looking for something and I realize it’s on my old Drobo. I plug it in and again, the bottom light, drive 4, flashes red. I buy a new 4TB drive (Seagate Barracuda Internal Hard Drive 4TB SATA 6Gb/s 256MB Cache 3.5-Inch (ST4000DM004)) and replace 4 - the bottom drive. The three lights above flash green and yellow. No light next to 4, the new drive.
I wait two weeks.
Still flashing green and yellow. I decide, for the first time since lighting up this old Drobo to plug it into my computer and see if the Drobo Dashboard will recognize it. No. Nothing. Doesn’t show up. Dashboard doesn’t see it. Disk utility doesn’t see it. I tried replacing USB cables. Tried using Firewire instead. Nothing.
I just don’t know what to do next. Why doesn’t my computer see the drive? Are there any tricks to get my Mac to see this drive? Is there any chance of saving the data?