4 of these drives good for 32tb 24/7 dlna nas server? Don’t want to beat a dead horse here... Really it’s just to stream my 10Bit 4K movies using DLNA

It all depends on what size and what RAID configuration you are asking about. Most people would be using RAID 5 or something like Synology's SHR (similar to RAID 5 but doesn't require equal size hard drives) for this purpose. If you are thinking that 4x8TB will give you 32TB of storage that is not correct in RAID 5 because of the overhead used for data protection. It works like this for RAID 5, 4x8TB = 24TB storage, 4x10TB = 30TB storage, 4x12 = 36TB storage. So first determine which RAID configuration works best for you and then find a RAID calculator available online to choose your RAID configuration and hard drive size. If you just want speed, with no parity checking then you could go with 4x8TB or 2x16 TB (whichever is cheaper) in RAID 0 for 32TB of storage but file corruption could be an issue and there is a possibility that you can only do 2 hard drives in RAID depending on your hardware. Having said all that, these drives will certainly stream 4k 10-bit HDR movies over DLNA. Streaming 4k is just as much up to the software and hardware of your computer than it is the hard drives. A nicely configured Windows machine, for example, may stream them fine however a less powerful NAS device may not. There are a lot of moving parts but these drives will not be an issue. There are also issues with playing the 265 codecs in Windows 10 Media Player but the same files that will not play in Media Player, will stream via DLNA to my LG TV just fine and play in full 2160p HDR with no problem. These same files will show up fine in my 9 year old NAS but will not stream via DLNA on it but photos stream fine. So it all depends on your exact configuration. But the drives are fine. If it all gets too hard then just get a fast (say 400 MB per second) USB stick and copy 10 movies at a time on to it and plug it into your TV. The Samsung BAR Plus 256 GB works well for this in my experience. You can also look into getting streaming server software on your computer and a client connected to your TV.

What is the difference between this and the WD Black drive?

The Red is engineered for 24/7 usage. The Black is not.

Is the red wd drives better for cctv/nvr in raid setup than the purple drives? i hear purple drives are not lasting long. both red and purple are 24/7

I use my purple drives with 9 cameras 24 x 7 and have over three years without a single failure. pretty good if you ask me.

Can I use this as an external storage for my desktop?

I have four of the earlier 3tB versions of this drive in external USB3 enclosures and use them in rotation for critical full system backups. They have served very well in that capacity. I also have one of the 3tB drives in my main daily-driver computer now and it does that quite well although it isn't as fast as some but since it is used mostly for secondary data store it doesn't matter so much. The reason that I have so many of the older 3tB drives is that I upgraded all of the drives in my Drobo NAS to 6tB drives a while back. Those drives as well as five of the 8tB units in another NAS have worked perfectly so I can highly recommend them (for the proper use, of course).

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Description

🚀 Elevate your data game with WD Red Pro – where speed meets unstoppable storage!

BUSINESS READY DURABILITY - Built to handle intense workloads with a 512MB cache and proven WD Red Pro reliability.
ROBUST RAID ZFS SUPPORT - Perfectly engineered for RAID arrays and advanced file systems, safeguarding your critical data.
7200 RPM PERFORMANCE BOOST - Experience lightning-fast read/write speeds that keep your NAS humming under heavy workloads.
ENTERPRISE GRADE 18 TB STORAGE - Store colossal data effortlessly with massive capacity tailored for growing businesses.
SEAMLESS 24 7 NAS COMPATIBILITY - Optimized for up to 24-bay NAS systems, ensuring reliable round-the-clock operation.

The WD Red Pro 18TB is a high-capacity, 3.5-inch SATA 6G hard drive spinning at 7200 RPM, designed specifically for medium to large business NAS environments. It supports up to 24-bay NAS systems and is optimized for continuous 24/7 operation, making it ideal for demanding RAID and ZFS file systems. With a 512MB cache and robust build quality, it ensures fast, reliable data sharing and backup for professional workloads.

Specifications

Brand	ウエスタンデジタル(Western Digital)
Manufacturer	Western Digital
Series	WD Red Pro
Product Dimensions	22.86 x 15.24 x 7.62 cm; 521.63 g
Batteries	1 AAAA batteries required.
Item model number	WD181KFGX-SPAFPN0
Is Discontinued By Manufacturer	No
Color	red
Form Factor	3.5-inch
Item dimensions W x H	22.9 x 15.2 x 7.6 cm
Hard Drive Size	18 TB
Hard Disk Description	Mechanical Hard Disk
Hard Drive Interface	Serial ATA-600
Hard Disk Rotational Speed	7200 RPM
Number of USB 2.0 Ports	1
Wattage	50
Hardware Platform	PC
Are Batteries Included	No
Lithium Battery Energy Content	2.6 British Thermal Units (BTUs)
Lithium Battery Packaging	Batteries contained in equipment
Lithium Battery Weight	0.5 milligrams
Number Of Lithium Ion Cells	7
Nombre de cellules Lithium-Métal	7
Item Weight	521 g

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