The cache is 256 MB, the storage technology is CMR (Conventional Magnetic Recording) and the hard drive is filled with air (no helium filling). The maximum workload rate per year is 180 TB, and the maximum internal transfer rate is 6 Gb/s (SATA 6 Gb/s) with a host-to-drive data rate of up to 178 MB/s. The speed is 7200 rpm. The speed is 7200 rpm. These figures correspond to the specifications for the WD82PURZ Surveillance hard drive from Western Digital.

The cache is 256 MB and the storage technology is CMR (Conventional Magnetic Recording). The hard drive is designed for surveillance applications and uses air rather than helium filling. The maximum workload rate is 180 TB per year. The maximum internal transfer rate is up to 175 MB/s. The interface is SATA with 6 Gb/s, and the speed is 5400 rpm.

The height of the hdd is 2.6 cm. The ubiquity is 2'71 cm. I don't think it will fit...

Yes, that's perfect. You have to check if your recorder supports 4TB, otherwise everything is perfect.

The product reference is as follows: Western Digital WD40PURX 4 TB

the drives are delivered in individual cardboard boxes with a layer of packaging foam inside

No not really, this hard disk is more for video security records system

...natürlich, besser WD RED 2TB. WD Red (2TB, 3.5", NAS, Storagesysteme)

According to my information, it is the same product, but with a new model and label designation. Unfortunately, I can't tell you whether there are any improvements on the part of the manufacturer that have not been communicated. For the same price, I recommend you go for the latest model (Z instead of X), i.e. WD30PURZ. Source: https://blog.dvrunlimited.com/archives/4173

As long as the server runs 24 hours a day, yes, because the disks are designed for 24/7 operation. Mine have been in operation for over 1 year without any problems.