i am confused in the difference between Removable media and Removable
device. can anyone tell it.
Depending on who is using them and context, perhaps none, as they get
used interchangeably sometimes, but commonly a ‘removable device’ is the
hardware - like a Zip drive - and ‘removable media’ is the cartridge or
tape - like a Zip disk - that the removable device uses. Things get
more ambiguous in practice for something like a USB pen drive, which
commonly get referred to as either. It really doesn’t matter all that
much, and if you’re talking or reading about device drivers, the
‘device’ is usually what will be meant.
Good luck,
mm
Mani wrote:
i am confused in the difference between Removable media and Removable
device. can anyone tell it.
… However, note as far as a NT filesystem is concerned there are two
different paths to worry about
There is the Verify Dance for removable media (this floppy disk has just
been popped and re-inserted, is it the same one or do I have to trash the
caches?) and the PnP Dance for removeable devices (someone has just yanked
out the thumb drive, live with it) . The FAT sources are a good place to
start looking: pnp.c and verfysup.c
Rid
“Martin O’Brien” wrote in message
news:xxxxx@ntfsd…
> Depending on who is using them and context, perhaps none, as they get used
> interchangeably sometimes, but commonly a ‘removable device’ is the
> hardware - like a Zip drive - and ‘removable media’ is the cartridge or
> tape - like a Zip disk - that the removable device uses. Things get more
> ambiguous in practice for something like a USB pen drive, which commonly
> get referred to as either. It really doesn’t matter all that much, and if
> you’re talking or reading about device drivers, the ‘device’ is usually
> what will be meant.
>
> Good luck,
>
> mm
>
> Mani wrote:
>> i am confused in the difference between Removable media and Removable
>> device. can anyone tell it.
>>
>>
>>
>>
>
This is a very good point indeed.
Once I was tasked with simulating removable media on a virtual file system
( a file systems on a folder and redirects the request to NTFS after
checking certain things …).
There is a huge difference between Removable media and Removable device. If
I could recall the crux is VPB.
-pro
----- Original Message -----
From: “Rod Widdowson”
Newsgroups: ntfsd
To: “Windows File Systems Devs Interest List”
Sent: Tuesday, November 20, 2007 11:55 PM
Subject: Re:[ntfsd] Removable media and Removable device
> … However, note as far as a NT filesystem is concerned there are two
> different paths to worry about
>
> There is the Verify Dance for removable media (this floppy disk has just
> been popped and re-inserted, is it the same one or do I have to trash the
> caches?) and the PnP Dance for removeable devices (someone has just
> yanked out the thumb drive, live with it) . The FAT sources are a good
> place to start looking: pnp.c and verfysup.c
>
> Rid
>
>
> “Martin O’Brien” wrote in message
> news:xxxxx@ntfsd…
>> Depending on who is using them and context, perhaps none, as they get
>> used interchangeably sometimes, but commonly a ‘removable device’ is the
>> hardware - like a Zip drive - and ‘removable media’ is the cartridge or
>> tape - like a Zip disk - that the removable device uses. Things get more
>> ambiguous in practice for something like a USB pen drive, which commonly
>> get referred to as either. It really doesn’t matter all that much, and
>> if you’re talking or reading about device drivers, the ‘device’ is
>> usually what will be meant.
>>
>> Good luck,
>>
>> mm
>>
>> Mani wrote:
>>> i am confused in the difference between Removable media and Removable
>>> device. can anyone tell it.
>>>
>>>
>>>
>>>
>>
>
>
>
> —
> NTFSD is sponsored by OSR
>
> For our schedule debugging and file system seminars
> (including our new fs mini-filter seminar) visit:
> http://www.osr.com/seminars
>
> You are currently subscribed to ntfsd as: xxxxx@garlic.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com
My apologies. This never even occurred to me. This is apparently what
happens when I post at two in the morning.
mm
Prokash Sinha wrote:
This is a very good point indeed.
Once I was tasked with simulating removable media on a virtual file
system ( a file systems on a folder and redirects the request to NTFS
after checking certain things …).There is a huge difference between Removable media and Removable device.
If I could recall the crux is VPB.-pro
----- Original Message ----- From: “Rod Widdowson”
> Newsgroups: ntfsd
> To: “Windows File Systems Devs Interest List”
> Sent: Tuesday, November 20, 2007 11:55 PM
> Subject: Re:[ntfsd] Removable media and Removable device
>
>
>> … However, note as far as a NT filesystem is concerned there are two
>> different paths to worry about
>>
>> There is the Verify Dance for removable media (this floppy disk has
>> just been popped and re-inserted, is it the same one or do I have to
>> trash the caches?) and the PnP Dance for removeable devices (someone
>> has just yanked out the thumb drive, live with it) . The FAT sources
>> are a good place to start looking: pnp.c and verfysup.c
>>
>> Rid
>>
>>
>> “Martin O’Brien” wrote in message
>> news:xxxxx@ntfsd…
>>> Depending on who is using them and context, perhaps none, as they get
>>> used interchangeably sometimes, but commonly a ‘removable device’ is
>>> the hardware - like a Zip drive - and ‘removable media’ is the
>>> cartridge or tape - like a Zip disk - that the removable device
>>> uses. Things get more ambiguous in practice for something like a USB
>>> pen drive, which commonly get referred to as either. It really
>>> doesn’t matter all that much, and if you’re talking or reading about
>>> device drivers, the ‘device’ is usually what will be meant.
>>>
>>> Good luck,
>>>
>>> mm
>>>
>>> Mani wrote:
>>>> i am confused in the difference between Removable media and
>>>> Removable device. can anyone tell it.
>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>> —
>> NTFSD is sponsored by OSR
>>
>> For our schedule debugging and file system seminars
>> (including our new fs mini-filter seminar) visit:
>> http://www.osr.com/seminars
>>
>> You are currently subscribed to ntfsd as: xxxxx@garlic.com
>> To unsubscribe send a blank email to xxxxx@lists.osr.com
>
>
This is simple. Think of a standard, NOT USB, floppy. It is NOT a
removable drive, but the media is removable. The old Syquest removable
media hard drives were, in some cases, removable media too. There were SCSI
versions that could be removable devices, but it was before the advent of
PnP in the Windows NT world.
A USB floppy drive is both. It is a removable device and has removable
media. USB keys are removable devices and usually not media, but I see
adapters for flash memory that are both, but I think they are expected to be
used as removable devices and the media swapped when disconnected.
“Mani” wrote in message news:xxxxx@ntfsd…
>i am confused in the difference between Removable media and Removable
>device. can anyone tell it.
>
>
>
>
Removable media is the standard PC floppy, or ATA/SATA attached CD drive.
Removable device is the USB or 1394 attached hard disk.
USB or 1394 attached CD is both removable media and removable device.
Media removal does not kill the device object, and is not a PnP thing. It
is the thing of the FSD and the disk class device driver.
Device removal kills the device object and is a PnP thing.
–
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com
“Mani” wrote in message news:xxxxx@ntfsd…
> i am confused in the difference between Removable media and Removable
> device. can anyone tell it.
>
>
>
>