I'm not quite sure on how to do what you're talking about, but there IS an HD option for the slimline PS2.
You need to get a USB-based HDD (A flash drive won't work, as it needs to be formatted in NTFS, and most flash drives don't support that.), then it's a simple matter of finding the USB version of HDLoader. I think it's called 'USB Advance' or something like that.
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