After update to 7.4.2 TC no longer shows external USB drive

Took me a long time to find a solution to this.
I came to make an archive of my Time Machine backup with a WD My Book 1TB drive connected to the USB Port on the TC. This WD drive has a large partition (MAC OS Extended Journaled) for the TC Archives and a smaller (FAT 32) partition for my Windows files (I have Vista running under VM Ware Fusion 3.1.1). I had done this twice last year with no problems and my Windows data still backs up using WD Backup Application to the Windows partition with no issues., however this time in Air Port Utility there was no USB disc available to archive to and when I looked in Finder only the Windows Partition was visible. I disconnected the WD drive from the TC and connected it to the iMac direct and both partitions were there but not when I connected it to the TC. Eventually I decided to downgrade the TC to firmware rev 7.4.1 and everything is now working fine.
This Firmware update has been available for several months so why has Apple not done anything to fix it? The later update 7.5.1 only works with the newer TCs so have they abandoned support for the early 2009 version?

Welcome to Discussions Big Apple!
Since you did not state which model of TC you are dealing and stated that 'The later update 7.5.1 only works with the newer TCs...' I'll have to assume you have the A1254 (MB277) and I have no ideal as to why 7.4.2 shouldn't work (I have 7.4.2 on my A1254). Using Airport Utility go into 'Manual Setup' and click on the Disks icon at the time; then click on 'File Sharing' and see if either 'Enable file sharing' and/or 'Remember this password in my keychain is checked.
Best to you!

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