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New HDDs (as of 2016) have 2 instead of 3 screwholes on left and right side, problem with disk trays
We just upgraded our RN 104 with 2 new 8 TB disks: Seagate Archive HDD v2 8TB, SATA 6Gb/s (ST8000AS0002) They are working fine, but I was having problems fixing them to the disk tray. New HDDs se...
Archive HDDs are not recommended for use in NAS units.
I did some research before making the choice. The disadvantages of Archive HDDs are: 1. compared with other recent HDDs, they have lower writing speed because they have to read data from nearby cylinders before writing (but compared to older HDDs they are not "slow" at all), 2. they have a transfer limit in "terabytes per year" which can void warranty if exceeded.
Both disadvantages are not important in our scenario. Our NAS is an archive, where lots of data is stored and rarely accessed.
AGSowjet wrote:
I did some research before making the choice. The disadvantages of Archive HDDs are: 1. compared with other recent HDDs, they have lower writing speed because they have to read data from nearby cylinders before writing (but compared to older HDDs they are not "slow" at all),
Writing to track 1000 destroys the content on track 1001. So you not only need to read track 1001, you then need to write it. That destroys track 1002. So the drive needs to "ripple" the writes until it reaches an unused track (or the end of the drive). The drive takes care of this automatically.
But sustained write speed is therefore extremely variable and geneerally much slower than older hard drives. There are some other implications - the drives will ignore spindown if they are in the middle of "rippling" the writes.
Also there have been some linus driver issues with these drives. I'm not sure if they are all resolved yet.
For what it's worth, my Seagate ST6000VN0021 (IronWolf NAS drive) also only has 2 holes per side, not 3,
Laserbait wrote:
For what it's worth, my Seagate ST6000VN0021 (IronWolf NAS drive) also only has 2 holes per side, not 3,
The WDC drives I use (both 6 TB and 8 TB) do have three holes on the side.
Assuming the holes on the bottom are aligned: you can remove the plastic tray insert and screw the drives into the tray from the bottom.
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