Question 1

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

Accepted Answer

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.

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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.

Question 4

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

Accepted Answer

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).

ASIN	B08K3TFM92
Amazon 売れ筋ランキング	パソコン・周辺機器 - 13,764位 ( パソコン・周辺機器の売れ筋ランキングを見る ) 内蔵型ハードディスクドライブ - 38位
GTIN (Global Trade Identification Number)	00718037875729, 71803787572900
HDD容量	18 TB
UPC	718037875729
おすすめ度	4.0 5つ星のうち4.0 (684) var
カラー	レッド
デジタルストレージの容量の測定単位	18 TB
データ転送速度	285 メガバイト毎秒
ハードウェアインターフェイス	SATA 6.0 Gb/s
ハードウェアプラットフォーム	PC
ハードディスク種類	メカニカルハードデイスク
ハードディスクのフォームファクター	3.5 インチ
ハードディスクインターフェイス	Serial ATA-600
ハードディスク回転数(rpm)	7200 RPM
フォームファクター	3.5インチ
ブランド名	WD
メーカー名	Western Digital
メーカー型番	WD181KFGX
ユニット数	1.0 個
互換デバイス	デスクトップ
付属品総数	1
取り付けのタイプ	内蔵ハードドライブ
同梱商品	WD Red Pro HDD
商品の用途	パーソナル, ビジネス, マルチメディア
商品の追加説明1	高速
商品の重量	18.4 オンス
型番	WD Red Pro
搭載済みキャッシュメモリサイズ	512
書き込み速度	285 MB/s
梱包タイプ	スタンダードパッケージング
読み込み速度	285 メガバイト毎秒
通信・接続インターフェース	SATA

WD181KFGX [WD Red Pro（18TB 3.5インチ SATA 6G 7200rpm 512MB）]

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