Question about SCSI device renumeration

Hi,
I'm using a USB flash drive that has a CD-ROM partition in it, and I
notice that everytime the device enumerates to Windows XP, its device
name gets incremented, eg from CdRom0 to CdRom1. This happens on both
a hard reset(when the UFD is unplugged and plugged back in), or a soft
reset. I've tried this on 2 different UFDs with different controller
chips and they exhibit the same behavior. The device name only gets
reset on a system reboot.

I'm wondering if this might be a problem if the same device enumerates
itself many times between system reboots. Will Windows run out of
numbers to assign the CdRom device? What's the limit, if there is one?

TIA

On Oct 26, 2:42 am, galapogos <gois...@gmail.com> wrote:
> Hi,
> I'm using a USB flash drive that has a CD-ROM partition in it, and I
> notice that everytime the device enumerates to Windows XP, its device
> name gets incremented, eg from CdRom0 to CdRom1. This happens on both
> a hard reset(when the UFD is unplugged and plugged back in), or a soft
> reset. I've tried this on 2 different UFDs with different controller
> chips and they exhibit the same behavior. The device name only gets
> reset on a system reboot.
>
> I'm wondering if this might be a problem if the same device enumerates
> itself many times between system reboots. Will Windows run out of
> numbers to assign the CdRom device? What's the limit, if there is one?
>
> TIA

It sounds like a device name persistence issue. I don't know the
details for a cdrom, but for tape drives you can set a registry value
so Windows will keep the old enumeration around instead of bumping it
up.

Try googling device persistence or tape persistence

Sorry I don't have more details - happy hunting