The Seagate ST14000NM000J (X18) and ST14000NM001G (X16) are part of the Exos enterprise hard drive series.

Capacity: 14TB
Interface: SATA 6Gb/s
Cache: 256MB, Multisegmented
Spindle Speed: 7200 RPM
Maximum Sustained Transfer Rate: Performance may vary based on the specific model
Helium Sealed-Drive Design: Yes
Conventional Magnetic Recording (CMR): Yes
Mean Time Between Failures (MTBF): 2.5 million hours
Nonrecoverable Read Errors per Bits Read: 1 sector per 10E15
Power-On Hours per Year: 24×7 operation
Environmental Limits: Operates within specific temperature and humidity ranges

For more detailed information, you can refer to the official Seagate datasheets:
https://www.seagate.com/files/www-content/datasheets/pdfs/exos-x18-channel-DS2045-3-2102US-en_US.pdf
https://www.seagate.com/files/www-content/datasheets/pdfs/exos-x16-DS2011-1-1904US-en_US.pdf