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Forum Discussion
Duo v2 only writes to first TB on 2TB USB
Hello, I have a Duo v2, firmware is 5.3.7 and I'm having issue with writing more than 1 TB to a 2 TB USB external. The external drive is seen as 2 TB by the Duo v2, and is formatted as NTFS. When c...
Here's an update and one solution, and I'm working on a second better solution.
The first ingredient to the problem: the external drive was formatted with MBR (master-boot-record) which can only be done on up to 2TB drives, above that GPT is needed. Second: the drive in the NAS has to be smaller than the partition you are trying to back up to. When I reduced the external drives partition by 30GB, thinking maybe there was just a slight difference in what 2TB meant to Windows and the NAS, the backup could proceed about 30-40GB further, then failed again. I then reduced the partition to 1.42TB with the NAS having 1.38TB (that's what 1.5 trillion byte drive formats to) and the backup completed fully. It even backed up the new files written after the first series failed. So once it works, it really rocks! This is the first and only issue I've had and overall I'm very impressed with the Duo v2. The issue is definitely within the firmware, and Tech support is aware of the issue up to the Engineering Dept. I'm sure they will have a fix out in the next (or so) firmware release(currently we're at 5.3.7) ... The second solution/test I'll try is to get rid of the MBR and use GPT partition for the whole 1.8TB (2 trillion bytes). I have a feeling it will work, otherwise a lot more people would be having this issue.
The first ingredient to the problem: the external drive was formatted with MBR (master-boot-record) which can only be done on up to 2TB drives, above that GPT is needed. Second: the drive in the NAS has to be smaller than the partition you are trying to back up to. When I reduced the external drives partition by 30GB, thinking maybe there was just a slight difference in what 2TB meant to Windows and the NAS, the backup could proceed about 30-40GB further, then failed again. I then reduced the partition to 1.42TB with the NAS having 1.38TB (that's what 1.5 trillion byte drive formats to) and the backup completed fully. It even backed up the new files written after the first series failed. So once it works, it really rocks! This is the first and only issue I've had and overall I'm very impressed with the Duo v2. The issue is definitely within the firmware, and Tech support is aware of the issue up to the Engineering Dept. I'm sure they will have a fix out in the next (or so) firmware release(currently we're at 5.3.7) ... The second solution/test I'll try is to get rid of the MBR and use GPT partition for the whole 1.8TB (2 trillion bytes). I have a feeling it will work, otherwise a lot more people would be having this issue.
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