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Multiple USB drives not recognized on EX2, only shares one drive

I’ve been using a couple of 3 and 4TB My Clouds for years, with multiple USB drives attached and working fine. One has a 4-drive box plugged into the single USB port, and it automatically shows up the 4 drives as shares.

I bought a new 5-drive box (Yottamaster) which works fine plugged into a Windows machine, shows all 5 drives separately like the old 4-drive box. I also bought a new EX2 ultra with the intent of plugging the 5-drive Yottamaster into the USB port. I checked before buying, and plugged the Yottamaster into my original 4TB My Cloud, and the shares all came up just fine, and they were accessible on the network. The new EX2 ultra arrived today and I set it up, updated the firmware, and then plugged in my Yottamaster, expecting to see the 5 drives show up as shares. (the USB icon identifies a single “JMicron USB to ATA Atapi Bridge” on both the old 4 drive and new 5 drive boxes, but the individual drives show up as shares once the My Cloud identifies them).

The drives do not show up as shares. They’re all NTFS formatted drives with data on them. The first drive, NAS_A4, shows up over the network in file explorer, but the rest never show. If I plug this same Yottamaster box into either of my old My Clouds, all the 5 drives appear, so it’s hard to blame the box. I looked for any settings, or a way to manually add the drives as shares, but can’t find any way.

I can still return the EX2 if it’s not going to work, and change my plans and just use one of the old My Clouds to host the Yottamaster 5 drive box, but it doesn’t make sense to me that all 5 drives are recognized fine in Windows, or if I plug it in to my router, but the EX2 doesn’t seem interested in finding anything but the first drive in the box. Any ideas would be appreciated, before I box it back up and return it.

Update: I hooked up my older 4-bay USB drive (which I have been using on one of the My Cloud 4TB devices to share 4 drives on the network) up to the new EX2 ultra, to see if it was possibly the Yottamaster 5-bay drive that was the problem. Not so. It found only one of the 4 drives, then seemingly quit looking. Same behavior as the new 5-bay drive when plugged into the EX2.

So now the puzzler: Why can I hook either of the 4-bay or 5-bay drives to the USB port on either of my WD My Cloud drives (both several years old, 3 and 4 TB) and all of the drives show up fine as shares. But plugging the same drive bays into the new EX2 ultra results in only one of the drives being found?

I can’t find any settings that sound like they would affect it, no way to force it to look for the other drives, etc. Both multi-drive bays are identified by the My Cloud as similar JMicron USB to ATA Atapi Bridge, and both function fine plugged into the older My Clouds, and show all drives as shares.

The EX2 works OK if I plug a powered USB hub into it and hook up 4 different drives, but the multi-drive bays only show one drive when plugged into the EX2. If they didn’t work on the older My Clouds it would be more understandable, but since they do, it’s a frustrating situation.

Hi @Flyinby,

There are many reasons a My Cloud does not recognize an attached USB device.

The link below is designed to assist in troubleshooting issues related to drives and devices not being recognized by a My Cloud: My Cloud: External USB Drive Will Not Mount, Not Seen or Detected

Support for Western Digital Hard Drives | Western Digital

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