Hello, i would like to make Backups of my 6 TB my Cloud Drive. The Problem is, the myCloud Drive only recognize HDDs smaller or equal 2 TB. I have tried to connect various 5 TB USB 3.0 Drives, NTFS formatted to the myCloud. Is there a TB Limit?
No there is no firm (known) TB limit on USB hard drives attached to the single bay My Cloud USB’s port other than the standard Linux limitations.
What version single bay My Cloud do you have? First gen 4.x or second gen v2.x? Are you running the latest firmware?
When you attached a hard drive larger than 2TB does the Dashboard Alert icon (
) indicate any sort of an error? When that drive is attached does the USB icon (
) in the Dashboard indicate a drive is connected?
On a first gen single bay My Cloud running latest v4.x firmware I have no problems using a 5TB Seagate Backup Hub Plus with the My Cloud as a Safepoint backup device.
It could be that his USB device is not properly partitioned.
At least on the Gen2, the automounter will only mount the first partition it finds, so if his device has multiple partitions, they will not be mounted.
Additionally, MBR style partition tables have a ~2TB limit due to 32bit LBA. To use larger drives, the volume must be prepared with GPT partitioning, and must be a filesystem capable of being made on that size of volume.
It could also be an issue with the cluster size used when he formats the NTFS volumes.
Here is the manual for the kernel module WD licensed to make the single bay MyClouds read NTFS volumes. It gives pretty useful information about what its capabilities and limitations are. Sadly, they did not seem to include the full utility package, just the kernel module.
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Thanks a lot!
Hello Wierd_w
thank you so much! This is the solution for me. It was not properly partitioned by Windows 10! There was a hidden partition on the HDD with 300 MB. I used Gparted to stripe the mainpartition over the whole place. And here we go! WD MyCloud is running well and i can use this HDD for Backup now 
Thx!
Not a problem! Noticed the “only partition 1 gets mounted” behavior when doing research into manually creating additional RAID arrays on USB via the console, had a small battle with the automounter, and learned all about its behavior.
The issue with GPT vs MBR is also important, but most devices over 2TB will already be GPT partitioned, unless something else tried to partition it later that does not know about GPT.
Regardless, I am glad it solved your issue!
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