18TB Seagate Drive in DS1817+Only Seeing 10TB in Windows mapping ?

[ICSTech]

Help required - Have 2 x 18TB Seagate iron wolf pro drives in a DS 1817+ they are setup as a Raid 1, within the synology unit it knows it as a 18TB but see's it as a 16TB, however when I map the drive in Windows 10 and 7 Pro computers, it only see's it as a 10TB Drive. Any ideas why this has occurred ? Also have in the other bays 16TB drives as raid 1 and they appear as 16tb when mapped in windows. Hope someone has a solution.

 

[Telos]

You do realize that an 18 TB drive has 16.37 TB of usable capacity? A 2x18 TB RAID1 will have just under 16 TB available capacity after the OS and swap partitions are created.

 

[Rusty]

I think the main problem here is the fact that he is not seeing 16+TB on that RAID1 setup but rather 10TB.

@ICSTech can you send a screen of your Storage manager pool and volume for the 2x18TB setup in question?

 

[ICSTech]

I think the main problem here is the fact that he is not seeing 16+TB on that RAID1 setup but rather 10TB.

@ICSTech can you send a screen of your Storage manager pool and volume for the 2x18TB setup in question?

Hi Rusty, you are correct, will get a screen shot when I can, as unit is off site. Synology sees drive as a 16TB, but when mapping the Raid 1 Drive in Windows to the Synology unit for unexplained reasons it sees it as a 10TB, will be in touch when I can obtain screen shots.

-- post merged: 20. Jul 2021 --

You do realize that an 18 TB drive has 16.37 TB of usable capacity? A 2x18 TB RAID1 will have just under 16 TB available capacity after the OS and swap partitions are created.

Hi Telos, please refer reply I gave to Rusty, as this partly explains my issue, more info to come soon. Thanks.

 

[ICSTech]

Have now removed the Raid 1 Seagate 18TB Drives, rebooted computer and Synology unit with Missing drives, shut it down again re-installed 18TB Drives and reconfigured Raid 1 setup, all now appears to work ok, does not see the entire 18TB, but at least I get 16.37TB being recognized, so all Good now. Still unknown as to why it initially only saw 10TB, when mapped from windows.