On Fri, Sep 11, 2009 at 9:04 PM, Arun Tomar <tomar.a...@gmail.com> wrote: > hi! > guys. > > i was trying to achieve the speeds mentioned according to the usb 2.0 specs. > http://en.wikipedia.org/wiki/USB_2.0#USB_2.0 > > i'm not anywhere near it. has anyone else faced similar issues. > > use case: > i've a 16 gig usb 2.0 pen drive and an amd athlon dual core system with usb > 2.0 ports. > > pasting my finding below > > a...@opensolaris:/media# rmformat > Looking for devices... > 1. Logical Node: /dev/rdsk/c11t0d0p0 > Physical Node: /p...@0,0/pci1043,8...@13,5/stor...@6/d...@0,0 > Connected Device: Kingston DT 101 II 1.00 > Device Type: Removable > Bus: USB > Size: 15.3 GB > Label: repo0906 > Access permissions: Medium is not write protected. > > > Sep 11 20:03:07 opensolaris usba: [ID 912658 kern.info] USB 2.0 device > (usb951,1625) operating at hi speed (USB 2.x) on USB 2.0 root hub: > stor...@6, scsa2usb1 at bus address 3 > Sep 11 20:03:07 opensolaris usba: [ID 349649 kern.info] Kingston DT 101 > II 001372982955F961061909AB > Sep 11 20:03:07 opensolaris genunix: [ID 936769 kern.info] scsa2usb1 is > /p...@0,0/pci1043,8...@13,5/stor...@6 > Sep 11 20:03:07 opensolaris genunix: [ID 408114 kern.info] > /p...@0,0/pci1043,8...@13,5/stor...@6 (scsa2usb1) online > Sep 11 20:03:07 opensolaris scsi: [ID 583861 kern.info] sd2 at scsa2usb1: > target 0 lun 0 > Sep 11 20:03:07 opensolaris genunix: [ID 936769 kern.info] sd2 is > /p...@0,0/pci1043,8...@13,5/stor...@6/d...@0,0 > Sep 11 20:03:07 opensolaris scsi: [ID 107833 kern.warning] WARNING: > /p...@0,0/pci1043,8...@13,5/stor...@6/d...@0,0 (sd2): > Sep 11 20:03:07 opensolaris sd_get_write_cache_enabled: Mode Sense > returned invalid block descriptor length > Sep 11 20:03:07 opensolaris genunix: [ID 408114 kern.info] > /p...@0,0/pci1043,8...@13,5/stor...@6/d...@0,0 (sd2) online > Sep 11 20:03:07 opensolaris genunix: [ID 314293 kern.info] device > pciclass,030...@5(display#0) keeps up device s...@0,0(disk#2), but the latter > is not power managed > Sep 11 20:03:07 opensolaris pcplusmp: [ID 805372 kern.info] pcplusmp: ide > (ata) instance 3 irq 0xf vector 0x45 ioapic 0x2 intin 0xf is bound to cpu 1 > > a...@opensolaris:/etc/webmin# dd if=/dev/dsk/c11t0d0p0 of=/dev/null bs=32k > ^C10042+0 records in > 10041+0 records out > 329023488 bytes (329 MB) copied, 18.0087 s, 18.3 MB/s > > a...@opensolaris:~/Azureus Downloads/Fedora-11-i386-DVD# dd > if=Fedora-11-i386-DVD.iso of=/dev/rdsk/c11t0d0p0 bs=32k > 112421+1 records in > 112421+1 records out > 3683829760 bytes (3.7 GB) copied, 865.186 s, 4.3 MB/s > > > > -- > Regards, > Arun Tomar > blog: http://linuxguy.in > website: http://www.solutionenterprises.co.in
Hello, it looks rather like slow flash memory, than anything related to USB. I have 8 modern hd disks connected to my x64 Laptop. All modern fast SATA2 drives in actively cooled USB2 enclosures (need to look up exact sata-to-usb bridge chipsets). All share the same USB bus. Plus: Among them are a pair of 1TB Seagate SATA2 disks connected via USB2, which are my primary boot disks (Everything here is ZFS). However, I do have one pen drive, a 4GB one. It is as slow as hell. Some computer bioses have problems to properly detect and correctly recognize certain USB2 devices during POST. They would only initiate them as USB1.1 devices, and the booting kernel would report contradictory messages, but at the end only operate them in slow legacy mode. Nevertheless: In your case you simply seem to have *slow* flash memory. Faster flash is costly as hell, and manufacturers may cheat you by only using the slow stuff. (%martin, OpenSolaris_enthusiast); _______________________________________________ opensolaris-discuss mailing list opensolaris-discuss@opensolaris.org
