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Eject and Unplug
OSR_Community_User
Member Posts: 110,217
in NTDEV
Hello,
Could somebody please explain the difference between Eject and Unplug ?
Thanks
Puja
Could somebody please explain the difference between Eject and Unplug ?
Thanks
Puja
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Comments
response to IRP_MN_QUERY_CAPABILITIES
If a PDO sets the EjectSupported bit, then it may receive an IRP_MN_EJECT
IRP after the last IRP_MN_REMOVE IRP. The device is expected to
physically remove itself from its enclosure, whereas Removable simply
means the user can unplug it while the host machine is online,
preferably after a controlled remove process (IRP_MN_REMOVE).
If a device is merely Removable, one can nonetheless call
CM_Request_Device_Eject() from user-mode to initiate removal. It
just won't get an eject IRP at the end.
-----------------------------------------------------------------------
Dave Cox
Hewlett-Packard Co.
HPSO/SSMO (Santa Barbara)
https://ecardfile.com/id/Dave+Cox
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Thursday, May 25, 2000 12:45 PM
To: NT Developers Interest List
Subject: [ntdev] Eject and Unplug
Hello,
Could somebody please explain the difference between Eject and Unplug ?
Thanks
Puja
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Sent: Thursday, May 25, 2000 7:44 PM
> Hello,
>
> Could somebody please explain the difference between Eject and Unplug ?
"Unplugging" implies that the *user* physically disconnects a device
attached to the computer. This can occur in a controlled (computer asked to
"allow" the unplugging first) or uncontrolled (computer not asked) manner.
Imagine a user frantically yanking out the cord for their USB camera because
Elvis just walked by their cubicle (this would be an example of the
uncontrolled case).
"Ejecting" means that the *computer* releases something that has been
inserted into it or it inserted into (media, port replicator, etc.) usually
only in an automatic, controlled manner. For example, imagine a motorized
CD-ROM drawer opening or PC Card popping out after the user has somehow
issued the appropriate "eject" command.
- Matt