4-Pin 12V 8.33A - 9A Power Adapter for Synology Disk Station 4-Bay DS410 DS410j DS411 DS411J DS412 DS412 + DS416 DS418 DS918+ DS923+ DiskStation Network Storage NAS Server 12V DC Power Supply

Well, the other morning I woke up to over 800 email notifications from my 6 year old Synology DS-918+, each one stating "abnormal power" on each different drive. The final E-Mail was that Storage Pool 1 was crashed. And here I thought having a one drive fault tolerance would be good enough to protect 30 years worth of documents, photos, music, and movies. If one fails then I'll just throw a new drive in, rebuild the array, and carry on. How wrong I was. It wasn't until I actually started think about what was actually irreplaceably important out of all that that I started freaking out and had an anxiety/panic attack last night. And then this power brick showed up today. My NAS is currently powered up, accessible, and copying all of the important stuff to both Storage Pool 2 on the DX517 Expansion module as well as to a standalone SATA drive plugged into a different system that I'll store elsewhere. One drive is "crashed" and in read-only mode. Fine, fine. I'll take it out, format it in a different system, replace it, and rebuild the array. The other one has a "System Partition Failed". Ok on that one too...that's a future problem to resolve. All drives report Healthy, so that's another plus...it's just the file system that has a problem. So...this purchase was worth every single penny and saved my sanity. I'm not sure what I'm going to do with all of the stock in Tums that I just purchased though. :D I've also got a new-open-box DS-920+ on the way. I'll throw 4 of my old 8TB drives in it, copy my data to it as well, plop it over at a friend's house, and figure out how to do remote syncing. This will not happen again!

had my synology ds918+ go offline while at a camp and when I came home, it was just off. my desktops were on, modem/router were on (both modem/router and nas are on a PSU, my one desktop that is not was still on, so not a power outage or it would be offline). Tried it on a different outlet, nothing. Pulled drives out, pulled extra ram out, nothing. Tested with multimeter and couldn't get any signal through it. one 2 of the prongs, the continuity test worked, but also noticed the green led light (didn't realize it had one) was off on the brick. Synology support said it was out of warrenty so no help there (not their issue really), so I decided to order one of these to rule that out. Came 2 days later, and when i plugged it in, green light on brick, hooked it into the nas and blue power light came on. Minute later, could connect to it. Not too bad of a fix cost after 4 years of non stop running. Might as well try that if you are getting the same thing with zero power coming, or your power brick is flickering.

Purchased this on 05/06/2024, and it died on 02/02/2026, connected to my Synology DS918+ NAS, and lost a WD Red Pro 10TB drive because of it. Thankfully, I'm running RAID5 and can swap in a new drive, but now I'm out $250+ for a new drive thanks to this thing failing. The power failure caused 2 drives to have issues (one entering Critical condition and another needing me to Repair System Partition). Thankfully, I saved one of the drives, but the other is dead in the water. I use a heavy-duty backup battery 600VA UPS, which was connected to as well, so it's not like there was a surge or power failure that caused anything else to happen. My recommendation: Buy a better brand and/or OEM external power supply for your NAS if the OEM dies.

About 4 years ago, in 2020, I bought a DS420+ to replace my aging 2-bay Synology NAS. One day, I found that it was powered off and I couldn't power it on. In my attempt to troubleshoot it, I decided to give a replacement power supply a shot. This power supply was able to power it on, indicating that the original Synology branded power supply had gone bad after 4 years of flawless operation. If you run into a similar situation where you need a replacement power supply for your Synology NAS, look no further. This appears to be a quality product that works just like the original Synology power supply.

The original PSU with my DS918+ died. It was connected, along with most of my networking equipment and server to an uninterruptible PSU. It appeared to short-circuit, because the UPS entered a fault state and shut down. With everything disconnected the UPS restarted fine, and everything but the DS918+ worked. Looked at different options on Amazon as replacements. What looks like the "official" replacement PSU at $60 is just ridiculous. This one is much more reasonable. It took longer than it should to be delivered - got "lost" in delivery, then "found" again a day later. While waiting, I snipped off the cable from the faulty UPS, and connected it to my bench power supply. (It's a coaxial cable, outer is negative, inner is positive, for anyone needing to know). This arrived a couple of days ago, and seems to be working just fine.

Works with my Synology DS 918+. Not really much else to say. It's a power adapter

When you need it, you need it! Never want to be down with a failure again, so I ordered one just to keep in the drawer.

So far so good one month in, ordered Dec 2025.

The power adapter on my 918+ died and I thought I needed a new unit but from other people online I saw replacing the ac adapter fixed the issues in a lot of cases and saved me a big headache.

Works perfectly and is a slight upgrade for my DS414

The power supply fails after 9 months... But it takes 3 weeks for many issues on my disks to die. Initially, I was thinking many of my Ironwold disks failed... Finally, I have a chance to have a friend with the same NAS, it tested this original power supply and the NAS and disks were working perfectly. Based on the previous review it's poor customer service & imaginary 3-year warranty. I have no idea who to contact to use the warranty! I do not recommend this product! I bought one from Synology directly, 63 USD + Shiping I used the support page because I didn't find a way to order it on the website.

Works with Synology NAS. So far so good, but who knows how long this one will last...