On Wed, 2019-12-25 at 08:51 +1100, Cameron Simpson wrote: > if you have multiple external drives (eg multiple backup drives > for space reasons, or both the 1 and 2 copies plugged in at once) I > recommend doing the backups in series, not in parallel; I've a little > 4 port USB4 hub and have had bad experiences trying to run both > drives at once - might be lack of power, might be dodgy hardware, > might be USB driver issues. Anyway, I/O errors ensued. I've always had foulups when doing lots of data across USB (especially when that was masses of small files). Partway through something would stuff up, transfers would jam or abort, and there'd be a pile of corrupted data. I've come to a few conclusions: Drives powered from your computer's USB socket are a bad idea. Drives with their own good quality power supplies are better (though there's a lot with crappy supplies). Drives in tiny cases, drives with bad heat dissipation, are bad news. The drives overheat when continuously churning data through for a while. If I ever had to copy a lot of data from one USB drive to another USB drive, that nearly always ended in tears. I don't think some computers are capable of prolonged throughput of data across USB. -- uname -rsvp Linux 3.10.0-1062.9.1.el7.x86_64 #1 SMP Fri Dec 6 15:49:49 UTC 2019 x86_64 Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx 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@xxxxxxxxxxxxxxxxxxxxxxx
