Satellite L300D will not recognize USB Disc unless WLAN is disabled

I have a venerable Satellite L300D running Vista SP2. I also have a Fujitsu 40Gb SATA disk drive from my old laptop in a USB 2.0 caddy, with dual USB plugs to draw more current.
I can connect the USB caddy successfully to my Windows 7 laptop through a single USB plug on a USB 2.0 socket so I know it works.
On the Satellite L300D it sets up the Generic USB disc in device manager, but does not register the 2 disk partitions as filestore in Windows Explorer. In fact when you try and expand COMPUTER in explorer it times out.
I noticed that the WLAN (Realtek TL8187B) is on the same USB 2.0 Controller, so I disabled it. This switched off my Wireless, but immediately Windows Explorer fired into life and I could access the partitions (D: and G:) and could even run check disk (no fails) and defragment it. As soon as I ENABLE the WLAN driver the disc fails to register.
I have updated the Realtek drivers from the Toshiba web site, but I would like a solution that allows me to use the disc AND the WLAN at the same time.
Anyone any ideas?

Thanks for getting back to me.
I use both USB drives and a Toshiba external HDD and SyncToy to backup my files - both without trouble. The Toshiba HDDworks fine today - in Device Manager it is recognised as "TOSHIBA External USB 3.0 USB Device" (even though I dont have USB 3.0 ports on my laptop) and is recognised by Partition manager as disc D:. The Disc caddy is recognised as "Generic USB Disk USB Device" - but not by Partition Manager - both use the same driver and hang off the same controller. The Caddy disc works fine on my other laptop (Windows 7) and once I've disabled the WLAN.
I had not done any specific driver downloads other than let Windows Update do its thing. It has taken me to Vista SP2 and I note that the "Standard Enhanced PCI to USB Host Controller" (above the USB Root Hub and USB Mass Storage Device in the Device Mgr hierarchy) are at File Version: 6.0.6002.18465(vistasp2_gdr.110505-037).
Since I noticed the recognition problems and interaction with WLAN, I have done some attempted repairs (1) downloaded the latest Toshiba realtek WLAN drivers "6.1162.0610 built by : Win DDK" (realtek_wlan_20100225.zip) - but it was failing before then. (2) I have also upgraded the BIOS to version 1.80. (3) The only other change I've made is to change the driver on the PCI bus from AMD (3GIO) Filter Driver to PCI Bus on advice from another forum.
When you say "remove the WLAN driver, reinstall the chipset driver and install the WLAN driver again" what exactly do you mean? EG in deveice manager - select WLAN - do uninstall ; what do you mean by chipset? - uninstall the Controller as well or some other device?
RgdsColin

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Satellite L300D will not recognize USB Disc unless WLAN is disabled

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