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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?
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With the device plugged in and turned on, open a console, su to root and run:
# /sbin/fdisk -l
Post the output of both here. The first command will list all partitions recognized by your system, whether mounted or not. See if there is a listing for any sda. The second will list all loaded modules. From that you can determine whether the modules necessary for the drive to be detected have been loaded. These include certain scsi modules, usb-storage and the usual usb modules, ehci and uhci. From there you can start to troubleshoot what's causing the problem.
The overlap is correct. hda4 is an extended partition and hda5 is the first extended/logical partition on hda4. This is completely normal. A hard drive can only have four primary partitions. In order to get around that limit, you create an extended drive with logical partitions on it. hda4 is the extended partition and holds all the extra logical partitions on the blocks it covers.