Internal Hard Drive

$350 each. 2pcs.-Seagate Exos X18 18TB Enterprise Internal HDD - CMR 3.5 Inch Hyperscale SATA 6Gb/s, 7200 RPM, 512e and 4Kn FastFormat, Low Latency with Enhanced Caching ( ST18000NM000J ). I wrote files to them once and they kept the files for about a year and did not make any records. Now the hard drives are disconnected from the computer and do not work.