RAID1 Drive Failure. Drive Compatibility Question.

WORKS2011
WORKS2011 used Ask the Experts™
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RAID1 configuration with two Western Digital Green Desktop Drives. One drive failed could I replace it with a Western Digital Purple 4T drive? Only difference I can tell is Sustained Throughput, green being 171 and purple 150. Green seem to be out of stock in most places and no longer available on Western Digitals site. I have purple drives in stock and wouldn't have to order a new drive.

Green Drive
Western Digital WD40EZRX 4TB Green
Capacity: 4TB
Speed: 5,400RPM
Interface Types: SATA
Form Factor: 3.5inx1.0in LFF Hard Drive
Sector Size: 512 / 512e
Sustained Throughput: 171
Electrical Interface: SATA 600 - 6.0Gbps
On-Board Cache: 64MB
green
Purple Drive
Western Digital WD40EZRX 4TB Green
Capacity: 4TB
Speed: 5,400RPM
Interface Types: SATA
Form Factor: 3.5inx1.0in LFF Hard Drive
Sector Size: 512 / 512e
Sustained Throughput: 150
Electrical Interface: SATA 600 - 6.0Gbps
On-Board Cache: 64MB
purple
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Dr. KlahnPrincipal Software Engineer

Commented:
WD Red (NAS) or Gold (server) would be a better choice, I think.

https://community.wd.com/t/drive-colors/222303

I would not trust a Purple drive in a RAID configuration if anything important was involved, though Purple would certainly be a better choice than Green.

Regarding whether you could swap in an unlike-model drive, that depends on the individual controller.  If you tell us that info then we can probably answer that question.
WORKS2011Managed IT Services, Cyber Security, Backup

Author

Commented:
I would not trust a Purple drive in a RAID configuration if anything important was involved, though Purple would certainly be a better choice than Green.
How do you feel if I replaced both green drivers with two purple drives? Not sure if you're saying you don't trust purple at all, or just don't trust purple combined with green.
Dr. KlahnPrincipal Software Engineer

Commented:
Purple drives are for surveillance, running 24/7.  While they are better quality than Green, they are intended for large data storage capability rather than reliability.

Much of this decision depends on how important the data is on the RAID set.  If it is backed up somewhere else at least monthly then Purple could be good enough for non-critical data storage.  If the data is being used in a business I would not recommend less than Red to a client.  Gold would be better.  For what it's worth, for myself I buy only RE-series drives which are "enterprise quality" and are built to higher standards.
Top Expert 2016

Commented:
Purples are for not many threads doing continuous writes. Not optimized I l for random read/writes. Green/Purple are generally 5400 RPM, REDS are 7200 or higher.
WORKS2011Managed IT Services, Cyber Security, Backup

Author

Commented:
According to my research Blue replaced Green several years back and it somewhat quietly happened in the background. I noticed on Western Digital's site they don't mention anything about the Green drives any longer. I think it's safe to say Western Digital discontinued the Green drives. There are plenty of refurbished green drives online but it makes sense now why local stores are not carrying them. I was told that Blue replaced the green and I found it to be the closest match. The spec sheet directly from Western Digital shows the Blue drive has a throughput of 175, however from the site I used to test the Green it came back an exact match with the following.

Blue Drive
Capacity: 4TB
Speed: 5,400RPM
Interface Types: SATA
Form Factor: 3.5inx1.0in LFF Hard Drive
Sector Size: 512 / 512e
Sustained Throughput: 171
Electrical Interface: SATA 600 - 6.0Gbps
On-Board Cache: 64MB

Spec sheet from Western Digital Blue Drive
blue spec sheet
Installing the Blue now will follow-up in the AM.
Top Expert 2013

Commented:
imo you can replace the drive with a purple one - it should work fine
though the proof of the pudding is in the eating
Tiborg GuaranaIT begins
Distinguished Expert 2018

Commented:
Depends on what you will work with on those disk. If raid for normal use, go with WD BLUE, or use one WD blue and one WD purple. How old were those WD Green?

My chooise would be 2 different brands.

One WD nad one Other.
AS far as the RAID 1 goes, all that matters is that the second drive has the same number of LBA (Logical Block Addressing) sectors.  Reestablishing the mirror is a different matter and depends upon how it was setup in the first place (BIOS or disk management).
David FavorFractional CTO
Distinguished Expert 2018

Commented:
Give a short description of your application. You'll likely have additional answers.

If you have a massive amount of continuous i/o, this might suggest other drive options.
Top Expert 2014

Commented:
@WORKS2011; you're right, the specsheet isn't at wd.com - here it is: http://products.wdc.com/library/SpecSheet/ENG/2879-771438.pdf - It does not list the sector count but other sites all list it as 7,814,037,168 bytes (512e sector size). Any replacement must match or exceed that number of sectors or it will not have enough capacity to rebuild the mirror.
Managed IT Services, Cyber Security, Backup
Commented:
I hope the comments I marked as useful everyone gets points. I'm not sure how the new system works yet so if you don't happy to do over. I feel the solution was the Western Blue I mentioned that replaced the Green. Great advice from everyone and much appreciated. Let me know how the points work, like I said not sure with the new system.

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