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.
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.