Using a Y-cable is fine.
Originally Posted by Mad Wolf
So far I have not heard of any HDD enclosures being incompatible with PS2ESDL yet.
If you are unsure, just avoid those that have cheap skate enclosures (Especially those with no brands).
Multi-functional devices are not supported.
Please use a device that was designed to only function as a USB mass storage device and nothing else (In other words, use a USB HDD that only functions as a USB HDD).
Unmodified SCPH-77006 with SM 3.6
SCPH-39006 with M-chip modchip, SCPH-10281 NA and refurb Seagate 80GB HDD
SCPH-10000 v1.00 with SCPH-10190 PCMCIA NA and SCPH-20400 HDD unit