4TB 64MB Cache 7200PM SATA 6.0Gb/s 3.5in Internal Surveillance CCTV DVR Hard Drive (MD4000GSA6472DVR) - w/ 2 Year Warranty, Mechanical Hard Disk

Built 2 RAID 5 NAS's with these, does the job well

March 2025: After 5 years, a failed UPS Backup killed this HDD; it was reliable after all, albeit noisey.May 2020: The MaxDigitalData 4TB 64MB Cache 7200PM SATA 6.0Gb/s 3.5" Internal Surveillance CCTV DVR Hard Drive was a very good buy. I've had it now for over two weeks, so this review isn't very pertinent. However, after reading the other reviews of longtime owners, I'm concerned about the longevity of this drive.The HDD that came with my inexpensive xMart-o CCTV NVR made *some* noise, like "chikka-chikka -chirrrrr, chikka-chikka". But this one started off with "WHARR WHARR GURRRR GURRRRR", that a "chkrrrlll chkrrrlll chkkrrrrlll". And it sometimes a hard grinding "WHHAAAAAHHHH" or "KHHRRRRRLLL". I am thinking there something wrong with this drive. I have deep concerns about the internals, and then I read about the heat (something that wasn't an issue my last drive). My last drive was "killed" because I couldn't my screen to come back on when it went out automatically. So I just unplugged it, and think it made "CHHKKKRRKKK" sound, after that it stopped being recognized. Not even when I put it inside an USB Enclosure and hooked it to my second PC.When I got the MaxDigitalData SATA HDD, the installation was flawless, and my system had no issue recognizing at initializing it. It even seems to run smoother. I did notice with the last HDD accessing video was sluggish. This does not seem to be the case with this drive. What I can report is that after two weeks the "WHHAARRRRWHARRRR" sound has stopped and has become a quieter ""qurrrrrllll qurrrlllll". Oh, well. It came with a two year warranty and I registered it online (I think..), so if anything happens between now and then...

I purchased a zosi security system off Amazon and I failed to realize that it did not come with a hard drive, so in short it takes video but does not record any.After looking and seeing the part I need the company itself recommends a different one that is double the cost almost $100. I did some digging and found this one for way less and decided to give it a shot.I am by no means technical or good with electronics but I did find a YouTube video and followed it and was able to install this in my system within about 20 minutes. Installation was pretty straightforward and so far it has worked great my system is recording green lights are on.The only thing I wish was different is they do not include the screws that go to the bottom of this too attach it inside your system. So you will have to pick up some little tiny screws to fit luckily I had a couple in my junk drawer that would make do.It's been going a few days now and so far it has been great and I'm glad that I did not have to spend triple the cost. So yes if you have a zosi system this will indeed fit as long as you go by all the instructions.

I purchased this product sometime back and has performed reliably

me parese bien

Update: My original 5 star rating has dropped to 3 stars.I discovered that my security system DVR cannot detect the MaxDigitalData drive during reboot after it has been running for awhile. Everything is OK again after power is removed and the drive cools down. Unfortunately the drive runs too hot and my DVR doesn't have a fan to cool it. I can't risk running my security system with this problem so I'm back to using the old 1TB WD Purple drive.I don't know if the problem I experienced is due to a defective drive or if it's intended that the host DVR have forced air cooling fan (there's no mention of this in the product details). Fortunately I was able to return the drive for refund.ORIGINAL REVIEW BELOW-------------------------------After seeing this 4TB drive's low price I decided it was time to increase the recording time on my three year old security system. It uses a Samsung SDR-B74301 DVR that has a factory installed 1TB (WD "Purple") drive.Installing the new 4TB drive took less than ten minutes. Summarized as follows:1. Perform Shutdown from the admin screen and then unplug the power cord.2. Remove cover (5 screws). Remove drive (4 screws). Unplug SATA cables from old drive.4. Install new drive. Reinstall the cover.5. Apply power. When the video image appears a message will report that the HD is not formatted.6. Log into the admin screen. Choose the Device->HDD tab and perform the format function.7. In less than a minute the HD is ready and working. Done!The larger hard drive has given me the freedom to increase the recording framerate & resolution. With the old hard drive I had to use lower resolution settings to ensure sufficient record time. Now I have much longer record times with improved image quality. By the way, I don't hear any drive noise during operation.The drive does not include cables or screws; Just re-use your existing hardware. Instructions are not provided with the drive so consult your security DVR manual if you need some technical hand holding. Or entice a techie friend to do it for you.

My hdd is quiet ! 24 hours working fine. As long as it hold up, I would buy again ! DVR case with no fan is about 130 f, NO FAN ! Not hdd case , whole dvr case. Mention of possible blocked vent hole, is for high altitude possible changes, like an airplane use. Not a concern. Just to let air pressure equalize.

Lo instale en diciembre y en enero se dañó pésima calidad del producto.