personally also mcloader is a bit offstardard in this way. it's badder.
i used to load *** explorer then mcloader then ps2rmp but i discovered it store all in subfolder by default but for error i tried deleting it. actually i can't delete it from the mc but only with a ftp session i resolved all by deleting all subfolders and all worked fine. i have about 6 mc but only one time i needed to format it (i have *** explorer with all the subfolder you want) when ar max corrupted his save and i couldn't delete it
ps2os betatester, ps2tools codev, hdldump frontend dev
6 sony mc w/ps2os 0.2.4, hdl, ps2rmp1.50,ps2mp3...
na+hd maxtor diamondmax 7200 120GB
PS2 SCPH-30004R V6 ÐM$3 V2 firm 2.4 B.4
PS2 SCPH-50003 V9 ÐM$4 PRO firm toxic os 0.1