CdUSB.Y or ISO NOT found !
Win7PESE can not mount and access files of your CD/DVD, USB, ISO on drive Y:

Possible Reason and Solutions :
1) You are using UFD (USB Flash Disk) as boot media formatted in NTFS.
---> Use FAT32 with UFD :>    ( Format UFD with FAT32).

2) You are not using .iso boot (You are using RealCD/DVD, BCD BOOTMGR, grub4dos BOOTMGR, etc.).
---> Check that the flag file CdUsb.Y is at the root of your media.
---> Your drive remained to the state "Not Ready" (More than 30 seconds) for a hardware reason.
---> Your drive is not recognised (driver missing or whatever, check if you can see your CD or Usb drive letter on explorer).

3) You are using .iso boot (grub4dos, isolinux, etc.) but you changed the build .iso name or path of your iso (ex: Win7PE_x86.iso, \Images\Win7PE_x64.ISO).

* If you use all from ram (all inside .wim) ignore this warning ;).
+ If you need files in your .iso to access, read following.

A) This feature requires imdisk, else will not work.
---> Be sure you have imdisk on your Win7PESE (Enable at Win7PESE\Tweaks).

B) Change your .iso name to the build .iso name (ex: Win7PE_x86.iso ) and put it to the correct path of your bootdrive.
---> Look for the default build configuration in the internal ini file (X:\Windows\System32\MountPEmedia.ini section IsoInfo/IsoName).
---> Rebuild by giving your personal Iso file name\Subfolder in the script Finals\Create ISO.

C) Use Win7PESE.ini to specify your personal .iso file name and location (solution for without rebuilding your project with your custom .isoname/subfolder settings).

3b) You are using .iso boot (grub4dos, isolinux, etc.) but .iso file to mount not accessible.
(= you can not see your Win7PESE iso file with explorer).
---> Driver missing -> add driver for your disk.
---> Some windows settings or software which disables mounting drives at boot -> disable such setting/software.
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MountPEmedia.exe : Mount files of your CD/DVD, USB, ISO on drive Y:

Ini File (MountPEmedia.ini) :
  [Settings]
  ProjectName=Win7PESE
  MountDrive=Y:
  SearchFlagFile=Yes
  FlagFileName=CdUSB.Y
  SearchExternalIniFile=Yes
  ExternalIniFileName=Win7PESE.ini
  DesktopWarningLabel=Win7PESE Warning

  [IsoInfo]
  IsoName=Win7PESE_x64.ISO

Program Imdisk found in : X:\windows\system32

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

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DRIVEGETDRIVE(ALL)

All drives are ready but without finding CdUSB.Y or the ISO file in the allotted time of 30 seconds ! Exit.