You'd be better off converting IDE to CompactFlash. CF cards are cheap, fast-ish and the adapter boards are readily and cheaply available.
IDE 40-pin to 44-pin adater
IDE 44-pin to CF adapter
64GB Compact Flash card
For storage replacement, there are a few options:
IDE to CompactFlash
IDE to mSATA or IDE to M.2 SATA
IDE to SD card