On 09/23/2014 03:28 AM, jd1008 wrote: > Have an external drive, wd20npvx , 2 tb. > It spinsx@7200rpms, and is touted to have 600 gigabit/s > on the wire speed. However, fc20 always connects it as > having dma100, when the esata port supports 300 gigabits/s > > So, what's with Fedora to limit it to dma100? > > To wit: > [ 3571.062358] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0) > . > . > . > [ 3571.063587] ata11.00: ATA-9: WDC WD20NPVX-00EA4T0, 01.01A01, max UDMA/133 > . > . > [ 3571.065292] ata11.00: configured for UDMA/100 You are confusing numbers. Forget about 600gigabits/s. SATA is 1.5Gpbs or 3.0Gbps or 6.0Gbps. Your drive link is working at 3.0Gbps, probably because you do not have a 6.0Gbps controller. (bps is bit per seconds, you have to divide by 10 to obtain bytes per second, 150MB/s, 300MB/s, 600MB/s) PATA had a lot of different transfer mode, the best of them were the UDMA/100 (100MBps) or, more rarely, UDMA/133 (133MBps). (Bps is bytes per second, 100MB/s, 133MB/s) AFAIK, UDMA values are often printed in SATA logs, with no real meaning at all. -- Roberto Ragusa mail at robertoragusa.it -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
