On 5/11/20 14:13, Alberto Bursi wrote: > > Afaik drive-managed SMR drives (i.e. all drives that disguise > themselves as non-SMR) are acting like a SSD, writing in empty "zones" > first and then running garbage collection later to consolidate the > data. TRIM is used for the same reasons SSDs also use it. > This is the way they are working around the performance penalty of > SMR, as it's the same limitation NAND flash also has (you can write > only a full cell at a time). > > See here for example > https://support-en.wd.com/app/answers/detail/a_id/25185 > > -Alberto Right, I understand that (some?) SMR drives support TRIM for the same reason that SSDs do (well, a very similar reason). My question was whether there'd be any reason for a NON-SMR drive to support TRIM, or if TRIM support necessarily implies shingled recording. I didn't know shingled recording was in any general purpose 2.5" spinning laptop drives like mine, and there's no mention of SMR in the HGST manual. Phil
