USB pen drive seen as read-only

[Marco Fioretti <m fioretti inwind it>]

Hello,

Yesterday I purchased an USB pen drive, connected it to a shrike PC
and, after manual mounting,  copied into it some files.

I then went to another shrike PC, mounted it manually again, copied all its
files on local disk. So far so good.

I then tried to cancel them on the pendrive, to copy other ones, and could not
do it because of "read-only filesystem"!

Same thing happens right now from another PC running RH7.2.
Mounting with -o rw option doesn't change anything. The relevant dmesg output
on this RH7.2 PC is pasted at the end of this message.

Ideas?

TIA,
                 Marco Fioretti

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parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)
PCI: Found IRQ 11 for device 00:0a.0
3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
00:0a.0: 3Com PCI 3c905B Cyclone 100baseTx at 0xdc00. Vers LK1.1.16
hub.c: USB new device connect on bus1/1, assigned device number 2
usb.c: USB device 2 (vend/prod 0xc76/0x7) is not claimed by any active driver.
SCSI subsystem driver Revision: 1.00
Initializing USB Mass Storage driver...
usb.c: registered new driver usb-storage
scsi0 : SCSI emulation for USB Mass Storage devices
  Vendor: Eutron    Model: Picodisk Easy     Rev: 1.00
  Type:   Direct-Access                      ANSI SCSI revision: 02
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 2
USB Mass Storage support registered.
Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0
SCSI device sda: 256000 512-byte hdwr sectors (131 MB)
sda: Write Protect is off
 sda: sda1
Filesystem panic (dev 08:01).
  fat_free: deleting beyond EOF
  File system has been set read-only
Filesystem panic (dev 08:01).
  fat_free: deleting beyond EOF
  File system has been set read-only