 Redundant array of independent disc or in this case an expensive disc. I started this and I'll leave link to the video About a year ago. We wanted to see some more durability testing with ZFS and free NAS And so these drives have been running for a long time and they finally gave me so many errors They got annoying they did develop bad sectors We think they were pending To give you the background is if you don't want to watch previous video These are a bunch of old used laptop hard drives that are not all the same We have a Hitachi Seagate a couple of Western Digitals, but they're not exactly the same model The only thing that these drives have in common is that they're all 5400 rpm They are all 500 gig and they are all very used out of old laptops that we've refurbished Frequently on laptops come in if we do any refurbishing ways pop a new hard drive in generally an SSD Because they're faster better and hard drives are not that expensive anymore So we were curious how ZFS would handle this and we wanted to do a real-world test Not just a bunch of synthetic read rights to it. So we set this up to be our nvr for the last Roughly a year and they did develop some bad sectors, which was not surprising at all They come came out of some pretty rough laptops and as you know laptops get bounced around a lot and Generally the hard drives are especially spinning hard drives and laptops I'm so happy to have SSDs in them now. They seem to have much better survivability rate But ZFS handled this like a champ even though these drives were mismatched, which is completely not the ideal situation But that was also part of the reason we wanted to do the testing We'll see if there was weird errors that came across these drives Oddly no weird errors. No unusual stuff Just regular read write errors based on a couple extra bad sectors that a couple of them developed over time But we think they had pending bad sectors back to them being out of a laptop that were fairly abused But no data loss as a recurring only some annoyances of getting the messages because our free NAS sends out a message when a Drive has an error, but ZFS is able to recover those errors So our long-term testing turned out to be fairly uneventful no data loss and no weird incompatibilities But it doesn't stop there In the midst of this and I've talked about these Toshiba drives before we don't know why and it Exclusively so despite having these and this is all in the same machine It's all in the same j-bot that we have for our free NAS with our running next to our production stuff These three terabyte Toshiba drives This is the last of them And they didn't die. Matter of fact, they found new life in other machines as independent drives They have a raw read error rate, which I've been told by some people you can ignore and smart But it's annoying because it is on one of the production drives And we have now swapped out all the Toshiba drives in our system and we've went fully We have 12 hgst drives in there. They've been my preferred hard drives I've talked about them on my back plays videos back plays has done a lot more statistical reporting than the 12 drives Tom has to tell you that hgst have a Extremely highly reliable track record and before you say but they're western digitals Hgst was purchased by western digital But as I understand from anything I've read From people talking from the company as they've left them very independent Which they didn't want to mess with their high reliability They just wanted to own a high reliability company and the two drives We've really been a go-to for no problems and all of our free NAS build have been Western digital reds which offer inexpensive Very low heat great storage all the wood wd red systems we built knock on wood none of them have Failed and the hgst's we've built quite a few hgst Arrays and none of those have had any issues at all. They have been great The only time I ever had one was we actually had a drive that was Cracked out of the box weirdest thing ever the corner was smashed apparently was dropped We tested that drive it did test bad it tested but had tons of bad sectors on it's the only time ever We've had a problem and granted that was for a backup server anywhere refurbished drives And only one of those refurbished drives had a problem. It's just for an extra redundant system But this is our quick follow-up on this and kind of the hard drives How they lasted I've had a lot of people ask can I mix mode hard drives? You can it's not ideal You may get weird errors. I'm actually surprised that having four different Model drives did not cause any errors or problems But having even when these were paired with other toshivas They constantly gave these errors and when we paired them all with There was three hgsts in one toshiba it lasted for the last year without an error then all sudden I got errors on this one too The drive test fine smart data is fine. We went through a shred process on it. It works So the drive doesn't seem to be bad at all, but we replaced it with an hgst popped it in there Resilvered the drive and everything works great. So this is just a quick follow-up on that It's not an ideal to do mix mode drives, but it does seem to work perfectly fine But occasionally you find weird incompatibilities and we're not sure because there's two two different controllers gave An error. So we don't know if it's something with the firmware on toshivas I'm not sure for reference. This is a toshiba p 300 hwd 130 7200 rpm You want to know the model numbers model numbers and these are completely not relevant They're creptastic drives out of old laptops 500 gig mixed drives, but So cool that it works like this So if you just need to store some data and maybe these aren't the most reliable drives, but as long as you have enough In the pool statistically it should work and you have an array of inexpensive drives But still always back up Like I said, just quick follow-up Hopefully this helps you in a little bit of your hard drive decision or if you just want to play around with Free to ask it's okay to load it on a bunch of old drives. Thanks Thanks for watching. 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