I'm not sure if IOUSBAttachedSCSI loaded tells us anything... I just checked with my MacBook Pro and before plugging in anything both it and IOUSBMassStorageClass were not loaded. Then I plugged in my Apricorn cable with SSD attached and both these changed to say loaded=yes.
So how to I tell if the device is actually using the faster protocol I wonder? Google turns up... https://discussions.apple.com/thread/6164330 and using the method described here I find that my Aprocorn cable does use IOUSBAttachedSCSI which suggests that I would not get better performance buying the startech one. So I now turn to my iMac desktop into which I have a couple of external drives connected, one for TimeMachine, the other as mass storage for my music and video library (my iMac is 100% built in SSD for FCP X performance, so I use external drives for the non performance-critical storage). Plug in my Apricorn and SSD and confirmed that it uses IOUSBAttachedSCSI. But now I discover that my WD My Passport 2TB external drives are using IOUSBMassStorageClass. I checked a seagate drive I use for TimeMachine on my MacBook Pro and it also uses MassStorageClass. Somehow I'm not excited about that. Now I know to look for UASP support next time I'm shopping for external drives. David On Wed, Oct 29, 2014 at 5:56 PM, Lonnie Abelbeck <[email protected]> wrote: > Hi David, > > I don't know... What I can say the StarTech cable will erase a 32 GB > SATA3 SSD in under 5 minutes and write the AstLinux image in a few seconds. > > I've never head of the UASP "USB Attached SCSI Protocol" before I saw this > cable: http://en.wikipedia.org/wiki/USB_Attached_SCSI > > As per the wiki entry, on my OS X 10.9 system... > -- > System Report... Software -> Extensions -> IOUSBAttachedSCSI -> Loaded: Yes > -- > So it may be worth $15 to try with Amazon Prime: > http://www.amazon.com/dp/B00HJZJI84/ > > Lonnie > > > On Oct 29, 2014, at 3:34 PM, David Kerr <[email protected]> wrote: > > > Lonnie, > > Thanks for the pointer to the USB-SATA cable. Their website seems to > claim that UASP support greatly improves performance over "standard" > cables. Have you compared this to other cables and have any experience? I > have a Apricorn cable I bought last year... > > http://www.newegg.com/Product/Product.aspx?Item=N82E16812161005 > > and it seems to work pretty well (I use it with a Crucial CT256M4SSD2CCA > SSD) I'm just wondering if $15 will buy me extra performance (on a MacBook > Pro). > > > > David > > > > On Wed, Oct 29, 2014 at 4:13 PM, Lonnie Abelbeck < > [email protected]> wrote: > > For those that use the Mac OS X "os-x-cf-write" script, an update can be > found here: > > > > http://lonnie.abelbeck.com/astlinux/info/os-x-cf-write.php > > > > Changes include: > > > > 1) Use /dev/rdiskN instead of /dev/diskN - faster and works better with > USB 3.0 connections. > > > > 2) add a bs=64k to dd - faster > > > > 3) continue to try a few eject's if the first fails > > > > 4) check if the script is run as 'sudo' at the beginning > > > > > > FYI, Also I received a new gizmo, $15 USD on Amazon... > > > > USB 3.0 to 2.5” SATA III Hard Drive Adapter Cable w/ UASP – SATA to USB > 3.0 Converter for SSD / HDD > > > http://www.startech.com/HDD/Adapters/USB-3-SATA-adapter-cable-with-UASP~USB3S2SAT3CB > > > > Much faster when I connect directly to my Mac with USB 3.0 . It also > works fine with USB 2.0 . > > > > Using this adapter a 32GB 2.5" SATA3 SSD can be erased and written in > under 5 minutes when connected to USB 3.0. Recommended. > > > > Lonnie > > > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > > Astlinux-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/astlinux-users > > > > Donations to support AstLinux are graciously accepted via PayPal to > [email protected]. > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > > Astlinux-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/astlinux-users > > > > Donations to support AstLinux are graciously accepted via PayPal to > [email protected]. > > > > ------------------------------------------------------------------------------ > _______________________________________________ > Astlinux-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/astlinux-users > > Donations to support AstLinux are graciously accepted via PayPal to > [email protected]. >
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