How to remount a USB drive
in [UK Mac]
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From: Rowland McDonnell on 22 Jan 2010 07:02 Woody <usenet(a)alienrat.co.uk> wrote: > Rowland McDonnell wrote: > > Woody<usenet(a)alienrat.co.uk> wrote: > > > >> Rowland McDonnell wrote: > > [snip] > > > >>> Quite. > >>> > >>> Caches... If nothing else, there're caches that need flushing out. > >> > >> Not post write caches on a memory stick there aren't. > > > > What exactly does that mean? > > It means that on a device marked as removable, information is written as > soon as it is available, rather than when it is more efficient to do it, > on the basis that it may be removed from the system at any time. Where is your evidence for this claim? I don't see any way it could be safe to make that assumption about a `removable' notice on the box - those who sell computer gear makers are all a bunch of filthy liars and mis-information artists trying to con the buying public out of their hard-earned with yet more false promises. > A normal disk has a read and write cache. A removable stick (excluding > one on windows marked for caching) has a read cache but not a write cache. Hmm - really? Okay, so what about buffers? Rowland. -- Remove the animal for email address: rowland.mcdonnell(a)dog.physics.org Sorry - the spam got to me http://www.mag-uk.org http://www.bmf.co.uk UK biker? Join MAG and the BMF and stop the Eurocrats banning biking
From: Rowland McDonnell on 22 Jan 2010 07:03 Andrew Templeman <andy(a)templeman.org.uk> wrote: > SteveH <italiancar(a)gmail.com> wrote: > > > Peter Ceresole <peter(a)cara.demon.co.uk> wrote: > > > > > T i m <news(a)spaced.me.uk> wrote: > > > > > > > And most pen drives probably are FAT aren't they (as / supplied / by > > > > default)? > > > > > > Yes. And one of my thumb drives is as delivered, still, just in case I > > > have to swap files with a PeeCee. But on the Mac, transfers are quicker > > > with a Mac formatted drive, so the first thing I normally do is to > > > reformat them to the bright side. > > > > On a related note - why do Macs copy to and from FAT sticks > > significantly quicker than Windows boxes do? > > On my XP machine the default policy is to 'optimize for quick removal' > which turns off caching for USB sticks. Righto - so when Woody said there was no write caching for USB memory sticks, he was wrong. Or have I misunderstood something? Rowland. -- Remove the animal for email address: rowland.mcdonnell(a)dog.physics.org Sorry - the spam got to me http://www.mag-uk.org http://www.bmf.co.uk UK biker? Join MAG and the BMF and stop the Eurocrats banning biking
From: Woody on 22 Jan 2010 07:20 On 22/01/2010 12:02, Rowland McDonnell wrote: > Woody<usenet(a)alienrat.co.uk> wrote: > >> Rowland McDonnell wrote: >>> Woody<usenet(a)alienrat.co.uk> wrote: >>> >>>> Rowland McDonnell wrote: >>> [snip] >>> >>>>> Quite. >>>>> >>>>> Caches... If nothing else, there're caches that need flushing out. >>>> >>>> Not post write caches on a memory stick there aren't. >>> >>> What exactly does that mean? >> >> It means that on a device marked as removable, information is written as >> soon as it is available, rather than when it is more efficient to do it, >> on the basis that it may be removed from the system at any time. > > Where is your evidence for this claim? In the microsoft disk management documentation for a start. There is a huge amount of it and it is quite detailed. There are plenty of places on the web that describe it in simpler terms though if you prefer. > I don't see any way it could be safe to make that assumption about a > `removable' notice on the box. What box? who was talking about any boxes? If you are refering to the packaging of a USB drive, they will tell you to eject first, so they don't get sued when you pull the disk out in the middle of a write. > - those who sell computer gear makers are > all a bunch of filthy liars and mis-information artists trying to con > the buying public out of their hard-earned with yet more false promises. Well, why use a computer then? Anyway, I am only discussing the technicalities of it, not your opinions on the world. >> A normal disk has a read and write cache. A removable stick (excluding >> one on windows marked for caching) has a read cache but not a write cache. > > Hmm - really? Yes, really. On windows you can switch caching on on a USB device if you want to use it for either 'ready boost' (which uses USB drives to boost magnetic disk performance in vista or above) or to increase performance, but then of course you can't just pull the disk out and expect no problems. I don't know the default caching scheme on OSX as apples documentation on it is not to the same level of microsofts and you don't have the same level of system control, ie, there are no user settings for USB on Mac OSX as there are on windows (vista and above). > > Okay, so what about buffers? What about buffers? They are areas of memory used to copy things from one place to another. They are empty when the files being copied have been copied (as indicated by the cessation of flashing on the USB drive) -- Woody
From: Woody on 22 Jan 2010 07:21 On 22/01/2010 12:03, Rowland McDonnell wrote: > Andrew Templeman<andy(a)templeman.org.uk> wrote: > >> SteveH<italiancar(a)gmail.com> wrote: >> >>> Peter Ceresole<peter(a)cara.demon.co.uk> wrote: >>> >>>> T i m<news(a)spaced.me.uk> wrote: >>>> >>>>> And most pen drives probably are FAT aren't they (as / supplied / by >>>>> default)? >>>> >>>> Yes. And one of my thumb drives is as delivered, still, just in case I >>>> have to swap files with a PeeCee. But on the Mac, transfers are quicker >>>> with a Mac formatted drive, so the first thing I normally do is to >>>> reformat them to the bright side. >>> >>> On a related note - why do Macs copy to and from FAT sticks >>> significantly quicker than Windows boxes do? >> >> On my XP machine the default policy is to 'optimize for quick removal' >> which turns off caching for USB sticks. > > Righto - so when Woody said there was no write caching for USB memory > sticks, he was wrong. No, I mean there is no default caching for USB memory sticks. You can certainly add some if you want > Or have I misunderstood something? Yes -- Woody
From: Rowland McDonnell on 22 Jan 2010 07:33
Woody <usenet(a)alienrat.co.uk> wrote: > Rowland McDonnell wrote: > > Andrew Templeman<andy(a)templeman.org.uk> wrote: > > > >> SteveH<italiancar(a)gmail.com> wrote: > >> > >>> Peter Ceresole<peter(a)cara.demon.co.uk> wrote: > >>> > >>>> T i m<news(a)spaced.me.uk> wrote: > >>>> > >>>>> And most pen drives probably are FAT aren't they (as / supplied / by > >>>>> default)? > >>>> > >>>> Yes. And one of my thumb drives is as delivered, still, just in case I > >>>> have to swap files with a PeeCee. But on the Mac, transfers are quicker > >>>> with a Mac formatted drive, so the first thing I normally do is to > >>>> reformat them to the bright side. > >>> > >>> On a related note - why do Macs copy to and from FAT sticks > >>> significantly quicker than Windows boxes do? > >> > >> On my XP machine the default policy is to 'optimize for quick removal' > >> which turns off caching for USB sticks. > > > > Righto - so when Woody said there was no write caching for USB memory > > sticks, he was wrong. > > No, I mean there is no default caching for USB memory sticks. You can > certainly add some if you want How can you be sure of that claim? Where is the evidence to back it up? > > Or have I misunderstood something? > > Yes Well, what? Rowland. -- Remove the animal for email address: rowland.mcdonnell(a)dog.physics.org Sorry - the spam got to me http://www.mag-uk.org http://www.bmf.co.uk UK biker? Join MAG and the BMF and stop the Eurocrats banning biking |