last night I removed folder \\D\M\D\3 (a Dell variant what got covered by another Driver elswhere.) and then simply deleted entire Massstorage.ini section for [D-3].
I 7zipped the Ini and D folder to build a new pack, and when I ran tests with that new pack no problem.

another way is to write a zero in drivercount= 1 for the driver you think you do not need.
(leave the folders as they are)

I think we are looking at an error in using 7zip here.
When you have packed up the files, check the zip.

the ini and a D folder have to be in root of what 7zip shows you.
(if you see a long named folder in there, it is BAAAAAAAD.)

   I made custom drivers packs removing unwanted drivers from chipset, lan, sound etc. but when removing from mass storage I get an error in texmode installation saying that files are missing. Double checked not removing the needed ones.

  Initially I thought removing entries for deleted drivers in .ini file could help ... but not. I've not touched ini files in other packs and them work fine.

  So I gave up, and as mass storage pack is relatively small I used the full package; integrated and installed fine. The drawback is that textmode loads lots of drivers not needed.

  I used version DP_MassStorage_wnt5_x86-32_705.7z

  Is there is a special technique to make a custom mass storage pack ? Is this an error solved in newest MS DP ? Is there any kind of relationship or dependency between drivers ? Because I remove or keep full branches.

  TIA, Oscar.