[ubuntu] USB Hard Drive not seen

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http://ubuntuforums.org – I got one of those cables that you can connect to caseless IDE or SATA hard drive and then plug it into a USB port and it's worked great for the most part. Out of 20 or so hard drives, it's only had problems with two IDE drives. At first, the system wouldn't see them and then I somehow got them mounted and I was able to copy my data off but I'm trying to connect them up again to securely wipe them and they're just not showing up in Disk Utility. I've tried rebooting several times without success and I was hoping one of you would have a suggestion or maybe a secret Linux command that would g (Hardware)