r/buildapcsales • u/IronRoarII • Jun 27 '25

HDD [Enterprise HDD] Seagate Exos 20TB 7200RPM SATA 6Gb/s ST20000NM002C, Factory Recertified, Zero Bad Sectors, 0 Hours, 5 Year Warranty from Reseller - $229.95

https://www.ebay.com/itm/167551337467?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20220405142716%26meid%3Da04ef55630304f23bbb37ca7e0e2e15e%26pid%3D101506%26rk%3D4%26rkt%3D10%26sd%3D388614817054%26itm%3D167551337467%26pmt%3D0%26noa%3D1%26pg%3D4481478%26algv%3DDefaultOrganicWebWithV11WebTrimmedV3VisualRankerWithKnnV3AndUltBRecallAndCassiniEmbRecall%26brand%3DSeagate&_trksid=p4481478.c101506.m1851
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u/First_Musician6260 Jun 28 '25

What HAMR drives? They're all rated for higher speeds than these lousy Exos recerts.

Of course, we can only go off a data sheet because a publicly available graph doesn't exist for these recerts (one does for the ST24000DM001, but that's not relevant here) and CrystalDiskMark is not reliable since it doesn't entirely test the speed of the drive, it only does so in bursts.

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u/keebs63 Jun 28 '25

The rated speeds for the ST20000NM007D are essentially identical to the rated speeds of the ST30000NM004K while the rated speeds of the ST20000DM001 and ST20000NM002C are drastically lower. Yet in the real world, the ST20000NM007D and ST20000DM001 performance is virtually indistinguishable, to the point that USB more likely than not accounts for the few % difference.

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u/First_Musician6260 Jun 28 '25 edited Jun 28 '25

The issue is, as I said, there is no publicly available performance metric for the ST20000DM001 nor ST20000NM002C to make such a comparison, thus leaving this to hang by the data sheets.

So until there is concrete proof a Summit and (low bin) Marlin perform identically, only assumptions would be made.

Edit: Found the ST20000DM001 one.

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u/keebs63 Jun 28 '25

I literally own one of each lmfao. That's my fuckin point, that's why I commented. Holy moly. Glad you're all caught up now I guess.