I can't figure out how to access the memory
stick.

From dmesg:

Initializing USB Mass Storage driver...
usb.c: registered new driver usb-storage
scsi1 : SCSI emulation for USB Mass Storage devices
Vendor: Sony Model: Storage Media Rev: PROL
Type: Direct-Access ANSI SCSI revision: 02
Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0
SCSI device sda: 256000 512-byte hdwr sectors (131 MB)
sda: Write Protect is off
sda: sda1 sda2 sda3 sda4
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 4
USB Mass Storage support registered.
mtrr: base(0xf8000000) is not aligned on a size(0x180000) boundary
PCI: Found IRQ 10 for device 00:01.0
FAT: bogus logical sector size 65535
VFS: Can't find a valid FAT filesystem on dev 08:01.
FAT: bogus logical sector size 65535
VFS: Can't find a valid FAT filesystem on dev 08:01.

Windows finds it, and it is formatted in vfat
and it does contain data. I made a directory,
/mnt/mem and I added this line to /etc/fstab:

/dev/sda1 /mnt/mem vfat rw,noauto,user 0 0

I can save to either /mnt/mem or /mnt/sda1 but
what happens is that it saves to the HDD, and
nothing ever appears on the memory stick, and
I can't read what is actually on the stick.

What am I doing wrong?