well....I won't claim that I know what I'm talking about but...
I open the mc directory on FlashFXP 3.0.2 it gives me 0 through 15 (i.e. mc/0, mc/1, mc/2 ... and so on)
concering the FTP choice, Bullet Proof FTP gives me the same results.
could it be that the memory card in slot 1 was not an official sony card?
However, if you say
perhaps I can load the expliot files to mc/1...
All the ones whith higher numbers are simply bogus mirrors
Sony SCPH-30001 R PS2 Unmodded
120GB 7200RPM WD Caviar HDD
Slightly Modded Sony Network Adaptor
HDA 2.0 + HDL, MCExploit, MyPS2, SMS 1.5