The reason the system disables the reset function is to protect the HDD from damage. Trying to bypass the protection with a double-tap allows the damage to happen. It should be common sense not to try to simulate a reset if normal reset is disabled...
My PlayStation2 HDD guide.
NTSC J SCPH 30000 with HDD and PSBBN 0.32
NTSC U/C SCPH 30001R Astral Blue LE PS2
Final Fantasy XI status:
Server - Ragnarok, Race - Mithra, Jobs - BLM 72 WHM 51 SCH 39 SMN 25, Nationality - Windurst, Name - Bungiefan