DatacenterDisk

781518B21: CMR or SMR?

Not stated: we hold no maker document that names 781518B21's recording technology. We know what the drive is - a HP 1.2TB SAS-12G hard drive (2.5") that we track - but a recording technology printed without a source is a guess, and for RAID, NAS or ZFS use that guess is the one that matters. Check the drive's label against the maker's data sheet, or choose one of the drives below whose CMR status is sourced.

MakerHP
Capacity1.2TB
InterfaceSAS-12G
Recording technologyNot sourced

In stock now at $55.00 (used). Buy on Amazon · listing details

How to settle it for this drive

Read the model number on the drive's own label, then find HP's data sheet or product manual for that family. A document that prints 781518B21 in its own row of a recording-technology table settles the question. A family page that names no part numbers does not: we have found maker pages that list neither a part number nor a recording method, and we no longer count them as sources. A retailer listing is not a source either - it is a seller's description, and sellers repeat what other listings say.

Documented HP drives at 1.2TB

We hold no maker document for any HP drive at 1.2TB yet, so there is no documented sibling to compare against.

When a source turns up

When we find a maker document that names 781518B21, this page will state the answer with that document linked and the date we read it, the same way our documented pages do. Until then, the honest answer is that we do not know.

In-stock drives with sourced CMR, 1.2TB and up