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Forum Discussion
3tb esternal USB hard drives under 4.2.17
Having some difficulty seeing the full 3tb on an external USB hard drive. I just updated the Readynas Pro Buisness from 4.2.5 -> 4.2.17 inorder to use 3TB drives as backup media. I had expected to ...
I have found that there are at least three different behaviours of the USB controllers out there when dealing with 3TB drives.
type1) Sees the drive as 2794GB and works correctly: NexStar CB-SATAU3
type2) Sees the drive as 2046GB but otherwise works correctly: BYTECC BT-370
type3) Sees the drive as ~768GB but otherwise works correctly: VanTec SATA/IDE to USB2 adapter
Note that the safety of the data on the drive seems to require using the same varient of controller with the drive. I have experienced data loss hooking up the drive to a different adapter which behaves differently without performing a format or any other activity
I have gotten the type 1 and type 2 controllers to successfully backup data to an Hitachi Deskstar 7200RPM drive with 64MB of cache (happens to be on the HCL list as I will use it in the ReadyNAS eventually)
Be careful out there but with care it does work correctly.
David
type1) Sees the drive as 2794GB and works correctly: NexStar CB-SATAU3
type2) Sees the drive as 2046GB but otherwise works correctly: BYTECC BT-370
type3) Sees the drive as ~768GB but otherwise works correctly: VanTec SATA/IDE to USB2 adapter
Note that the safety of the data on the drive seems to require using the same varient of controller with the drive. I have experienced data loss hooking up the drive to a different adapter which behaves differently without performing a format or any other activity
I have gotten the type 1 and type 2 controllers to successfully backup data to an Hitachi Deskstar 7200RPM drive with 64MB of cache (happens to be on the HCL list as I will use it in the ReadyNAS eventually)
Be careful out there but with care it does work correctly.
David
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