On Fri, 2021-06-18 at 19:36 -0300, George N. White III wrote: > > The power block says its output is 3A at 12V. > > > > The drives are both WD model WD10EZEX, (though the label on one > > says > it > > has a 64MB cache and the other doesn't). Both labels say 5VDC, > > 0.68A > > and 12VDC, 0.55A. Looks like the dock's power should be enough. > > > > The spec sheet < > https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/internal-drives/wd-blue-hdd/product-brief-western-digital-wd-blue-pc-hdd.pdf > > > says 12V peak load is 2.5 A. It does take power to spin up to 7500 > RPM, > and I doubt your > supply could survive without staggered startup. >
I see. That makes sense I guess, but 30 seconds is still a very long time to wait for the first drive to reach speed before spinning up the second one. Unfortunately the data sheet says nothing about start time. > > > > > Amazon has a popular Sabrent disk-only dock -- one review notes: > > > > > > Cons > > > - when using 2 drives and plugging or unplugging one drive BOTH > > > go offline, at least temporarily. NOTE: Seems to be a common > limitation > > > to all these docks. I have yet to find one that does not behave > this > > > way. > > > Must be the way the SATA bus controller is designed. > > > - when plugging in 2 drives, they mount sequentially, meaning you > > > have to wait for one to mount before the other will > > > > My problem is that one drive comes up almost instantly and the > > other > > takes 30 seconds. In fact I can live with that. My real gripe is > > that > > the kernel makes me wait even though the drive is not being > > accessed. > > If it just wants to make the drive available, it should be able to > wait > > asynchronously. > > > > Agreed, but then you need a way to tell the kernel that it won't need > anything > from the external drives so it is OK to continue booting. Have you > considered > automounting the drives? They are automounted, and have been ever since I started using them. The drives are used almost exclusively for backup during the night, which is why I want them spun down most of the time and started on demand. poc _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
