Safely Remove Hardware? Does it turn off Power?

Jim Applebury · External Since: Apr 04, 2006 Posts: 1

I've been trying to research for our Computer Club whether or not the "Safely
Remove Hardware" applet actually turns off the power to the device and if
does, does it wait for the device to be physically removed before returning
power to the port?

I've noted the light on my USB flash drive goes out after sending the remove
command which seems to support this. I've also seen reference to the D3
power state when this command is sent but I've seen different D3 states
referenced on hot-pluggable devices.

I sure will appreciate any and all input.
Thanks,
Jim

Doron Holan MS1 · External Since: Jan 28, 2004 Posts: 61

it depends on the bus. the underlying bus driver will turn the device off.
it will be powered on when the device is restarted or if the device is
removed and reinserted.

d

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"Jim Applebury" <Jim Applebury RemoveThis @discussions.microsoft.com> wrote in message
news:1108BEA0-245F-4EE3-A13C-0BAA439A20E6@microsoft.com...
> I've been trying to research for our Computer Club whether or not the
> "Safely
> Remove Hardware" applet actually turns off the power to the device and if
> does, does it wait for the device to be physically removed before
> returning
> power to the port?
>
> I've noted the light on my USB flash drive goes out after sending the
> remove
> command which seems to support this. I've also seen reference to the D3
> power state when this command is sent but I've seen different D3 states
> referenced on hot-pluggable devices.
>
> I sure will appreciate any and all input.
> Thanks,
> Jim

Jim Applebury · External Since: Apr 04, 2006 Posts: 2

Thanks Doron,
So I can report that when the light goes out on my USB flash drive that the
power is off and only after a reinsertion does the power return?
Is this refered to by "Selective Suspension of USB"?
Thanks Again,
Jim

"Doron Holan [MS]" wrote:

> it depends on the bus. the underlying bus driver will turn the device off.
> it will be powered on when the device is restarted or if the device is
> removed and reinserted.
>
> d
>
> --
> Please do not send e-mail directly to this alias. this alias is for
> newsgroup purposes only.
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>
> "Jim Applebury" <Jim Applebury.DeleteThis@discussions.microsoft.com> wrote in message
> news:1108BEA0-245F-4EE3-A13C-0BAA439A20E6@microsoft.com...
> > I've been trying to research for our Computer Club whether or not the
> > "Safely
> > Remove Hardware" applet actually turns off the power to the device and if
> > does, does it wait for the device to be physically removed before
> > returning
> > power to the port?
> >
> > I've noted the light on my USB flash drive goes out after sending the
> > remove
> > command which seems to support this. I've also seen reference to the D3
> > power state when this command is sent but I've seen different D3 states
> > referenced on hot-pluggable devices.
> >
> > I sure will appreciate any and all input.
> > Thanks,
> > Jim
>
>
>

Doron Holan MS1 · External Since: Jan 28, 2004 Posts: 61

that is true for a device that is not externally powered. selective suspend
is something else entirely. selective suspend is when devices are turned
off after they have idled out (in very simple terms).

d

--
Please do not send e-mail directly to this alias. this alias is for
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"Jim Applebury" <JimApplebury DeleteThis @discussions.microsoft.com> wrote in message
news:BD429E60-9CEF-41E7-A1DD-9356F0B5EDB8@microsoft.com...
> Thanks Doron,
> So I can report that when the light goes out on my USB flash drive that
> the
> power is off and only after a reinsertion does the power return?
> Is this refered to by "Selective Suspension of USB"?
> Thanks Again,
> Jim
>
> "Doron Holan [MS]" wrote:
>
>> it depends on the bus. the underlying bus driver will turn the device
>> off.
>> it will be powered on when the device is restarted or if the device is
>> removed and reinserted.
>>
>> d
>>
>> --
>> Please do not send e-mail directly to this alias. this alias is for
>> newsgroup purposes only.
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>>
>> "Jim Applebury" <Jim Applebury DeleteThis @discussions.microsoft.com> wrote in
>> message
>> news:1108BEA0-245F-4EE3-A13C-0BAA439A20E6@microsoft.com...
>> > I've been trying to research for our Computer Club whether or not the
>> > "Safely
>> > Remove Hardware" applet actually turns off the power to the device and
>> > if
>> > does, does it wait for the device to be physically removed before
>> > returning
>> > power to the port?
>> >
>> > I've noted the light on my USB flash drive goes out after sending the
>> > remove
>> > command which seems to support this. I've also seen reference to the
>> > D3
>> > power state when this command is sent but I've seen different D3 states
>> > referenced on hot-pluggable devices.
>> >
>> > I sure will appreciate any and all input.
>> > Thanks,
>> > Jim
>>
>>
>>

Jim Applebury · External Since: Apr 04, 2006 Posts: 2

Thanks Again... Had a hard time finding a definitive answer.
Take Care Jim

"Doron Holan [MS]" wrote:

> that is true for a device that is not externally powered. selective suspend
> is something else entirely. selective suspend is when devices are turned
> off after they have idled out (in very simple terms).
>
> d
>
> --
> Please do not send e-mail directly to this alias. this alias is for
> newsgroup purposes only.
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>
> "Jim Applebury" <JimApplebury.TakeThisOut@discussions.microsoft.com> wrote in message
> news:BD429E60-9CEF-41E7-A1DD-9356F0B5EDB8@microsoft.com...
> > Thanks Doron,
> > So I can report that when the light goes out on my USB flash drive that
> > the
> > power is off and only after a reinsertion does the power return?
> > Is this refered to by "Selective Suspension of USB"?
> > Thanks Again,
> > Jim
> >
> > "Doron Holan [MS]" wrote:
> >
> >> it depends on the bus. the underlying bus driver will turn the device
> >> off.
> >> it will be powered on when the device is restarted or if the device is
> >> removed and reinserted.
> >>
> >> d
> >>
> >> --
> >> Please do not send e-mail directly to this alias. this alias is for
> >> newsgroup purposes only.
> >> This posting is provided "AS IS" with no warranties, and confers no
> >> rights.
> >>
> >>
> >> "Jim Applebury" <Jim Applebury.TakeThisOut@discussions.microsoft.com> wrote in
> >> message
> >> news:1108BEA0-245F-4EE3-A13C-0BAA439A20E6@microsoft.com...
> >> > I've been trying to research for our Computer Club whether or not the
> >> > "Safely
> >> > Remove Hardware" applet actually turns off the power to the device and
> >> > if
> >> > does, does it wait for the device to be physically removed before
> >> > returning
> >> > power to the port?
> >> >
> >> > I've noted the light on my USB flash drive goes out after sending the
> >> > remove
> >> > command which seems to support this. I've also seen reference to the
> >> > D3
> >> > power state when this command is sent but I've seen different D3 states
> >> > referenced on hot-pluggable devices.
> >> >
> >> > I sure will appreciate any and all input.
> >> > Thanks,
> >> > Jim
> >>
> >>
> >>
>
>
>

garyoliver · External Since: Mar 11, 2009 Posts: 1

Hi

When I removed my 8 Gb PQI usb memory stick with the light on but after
safely shutdown, I lost all my data

Why can't we have back the "light off" feature from XP and earlier
windows?

Warm regards/gary

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Doron Holan [MSFT] · External Since: Mar 11, 2009 Posts: 2

the state of the light had nothing to do with data integrity, it only has to
do with if there is enough power on the usb hub port to power the device

d

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"garyoliver" <garyoliver.3ov6bb.RemoveThis@DoNotSpam.com> wrote in message
news:garyoliver.3ov6bb@DoNotSpam.com...
>
> Hi
>
> When I removed my 8 Gb PQI usb memory stick with the light on but after
> safely shutdown, I lost all my data
>
> Why can't we have back the "light off" feature from XP and earlier
> windows?
>
> Warm regards/gary
>
>
> --
> garyoliver
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garyoliver · External Since: Mar 12, 2009 Posts: 1

Thanks

My understanding is if the power is off to the memory stick there is no
chance of the data being corrupted during removal. This only happened
with vista.

Warm regards/gary

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Doron Holan [MSFT] · External Since: Mar 11, 2009 Posts: 2

not true. once the device has been safely removed, the drivers on top of it
have been unloaded and all data has been flushed.

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"garyoliver" <garyoliver.3owpvb DeleteThis @DoNotSpam.com> wrote in message
news:garyoliver.3owpvb@DoNotSpam.com...
>
> Thanks
>
> My understanding is if the power is off to the memory stick there is no
> chance of the data being corrupted during removal. This only happened
> with vista.
>
> Warm regards/gary
>
>
> --
> garyoliver
> ------------------------------------------------------------------------
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> View this thread:
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