When I insert a usb pendrive (in Suse 10.2) it is recognized, as "sdb1" or "sdf1", but after a while it disconnects itself.
I think it happens because I'm using a scsi hard disk, which is recognized as "sda".
I' ve tried other distributions (like Debian) with same results.
Can someone explain me how to solve this ?
Thanks.

After you think the drive disconnects itself, open up the console and enter

dmesg

Copy/Paste and post the last 20 or so lines !

After the drive disconnects dmesg gives me these lines

usb 3-6: USB disconnect, address 2
usb 3-6: new high speed USB device using ehci_hcd and address 4

Then, I reinserted the pen and when disconnected again, I get this

usb 3-7: new high speed USB device using ehci_hcd and address 5
usb 3-7: new device found, idVendor=0930, idProduct=6533
usb 3-7: new device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-7: Product: DataTraveler 2.0
usb 3-7: Manufacturer: Kingston
usb 3-7: configuration #1 chosen from 1 choice
scsi6 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 5
usb-storage: waiting for device to settle before scanning
Vendor: Kingston Model: DataTraveler 2.0 Rev: 1.00
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sdb: 1001472 512-byte hdwr sectors (513 MB)
sdb: Write Protect is off
sdb: Mode Sense: 0b 00 00 08
sdb: assuming drive cache: write through
SCSI device sdb: 1001472 512-byte hdwr sectors (513 MB)
sdb: Write Protect is off
sdb: Mode Sense: 0b 00 00 08
sdb: assuming drive cache: write through
sdb: sdb1
sd 6:0:0:0: Attached scsi removable disk sdb
sd 6:0:0:0: Attached scsi generic sg1 type 0
usb-storage: device scan complete
usb 3-7: USB disconnect, address 5
usb 3-7: new high speed USB device using ehci_hcd and address 6