On Jan 25, 2009, at 2:55 PM, Maxim Sobolev wrote: > Peter Jeremy wrote: >> On 2009-Jan-24 12:30:56 -0800, Maxim Sobolev <sobomax_at_freebsd.org> >> wrote: >>> I wonder if this situation can be handled automatically. To my >>> ignorant view, our USB mass storage driver can try sending >>> "synchronize cache" command and if that fails then failback to the >>> NO_SYNCHRONIZE_CACHE behavior. >> This has been discussed in the past. The problem is that some drives >> lock up when you send a "synchronize cache" command so this isn't a >> general solution. > > So what? The drive that is not in the quirks won't work anyway, so > that if by auto-detection you can make at least fraction of those > drivers working out of the box it would be an improvement. I wonder > how other operating systems (Windows, Linux) cope with this issue. > Not sure about a Linux, but I really doubt Windows has anything like > our quirks, yet all drives work with it. Windows has write caching disabled by default. You need to turn it on per-device from the Device Manager by right-clicking on the device, selecting properties, going to the "Policies" tab and selecting "Optimize for performance" (The default is set to "Optimize for quick removal"). Cheers, Andy /* Andre Guibert de Bruet * 436f 6465 2070 6f65 742e 2042 6974 206a */ /* Managing Partner * 6f63 6b65 792e 2053 7973 4164 6d69 6e2e */ /* GSM: +1 734 846 8758 * 2055 4e49 5820 736c 6575 7468 2e00 0000 */ /* WWW: siliconlandmark.com * C/C++, Java, Perl, PHP, SQL, XHTML, XML */Received on Sun Jan 25 2009 - 22:45:05 UTC
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