For Slackware 13.37 here is what I have found in /proc for the flash drive:
# cat /proc/scsi/scsi
Host: scsi11 Channel: 00 Id: 00 Lun: 00
Vendor: SanDisk Model: Cruzer Rev: 1.26
Type: Direct-Access ANSI SCSI revision: 02
# ls /proc/scsi/usb-storage
# cat /proc/scsi/usb-storage/13
Host scsi13: usb-storage
Serial Number: 20060775120CCBC0F3E6
Protocol: Transparent SCSI
# cat /proc/scsi/sg/device_strs
ATA WDC WD800JB-00JJ 05.0
ATA WDC AC22000L 32.4
PHILIPS DVD+-RW DVD8701 5D24
E-IDE CD-ROM Max 50X 6.40
SanDisk Cruzer 1.26
Some of this information must be gained within about 2 minutes of connecting the flash drive or it will disappear.
I have not confirmed this but believe that the flash drive must be mounted to preserve the information longer and an entry must exist in /etc/fstab in order to mount it.
Can someone confirm this otherwise I cannot know if the device is failing or not.