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Date: Sun, 3 Jun 2012 10:25:21 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Subject: reverse USB driver - is it possible?
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for SCSI/SAS/FC there is targ(4) driver allows you to become SCSI target.

is it the same possible with USB?
i mean if i can make my laptop to simulate say USB CDROM.

Yes there are no driver line targ(4) for USB, but it is technically 
possible hardware-wise? with any USB controler or special one?