Photoshop Lightroom "Preferences" and "Database/Catalog" files?

Lightroom 5
This Adobe TechNote lists the locations for the Lightroom 5 http://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroom-41.html
Lightroom 4
This Adobe TechNote lists the locations for the Lightroom 4    http://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroom-4.html
Lightroom 2 and 3
This Adobe TechNote lists the locations for the Lightroom 2.x and Adobe TechNote lists the locations for Lightroom 3.x Preference, Presets and Database/Catalog files.  The location information provided in the Technote is summarised below:
Mac
The Photoshop Lightroom application is the Adobe Lightroom 2.app file, located in the Applications folder.
The preference file is the com.adobe.Lightroom2.plist file, located in the[username]/Library/Preferences folder.
The following Photoshop Lightroom database files are located in the[username]/Pictures/Lightroom folder:
Lightroom 2/3 Catalog.lrcat (the catalog itself)
Lightroom 2/3 Catalog.lrcat.lock (this file prevents you from overwriting data)
Lightroom 2/3 Catalog Previews.lrdata (the file that holds the preview data assigned to your photos)
Windows XP
The Photoshop Lightroom application is the Lightroom.exe file, located in the Program Files/Adobe/Adobe Photoshop Lightroom 2 folder.
Preferences are located in the Lightroom 2 Preferences.agprefs file, located in the Documents and Settings/[username]/Application Data/Adobe/Lightroom/Preferences folder.
The Photoshop Lightroom database file, Lightroom 2/3 Catalog.lrcat, is located in the Documents and Settings/[username]/My Documents/My Pictures/Lightroom folder:
Previews are located in various folders in the Documents and Settings/[username]/My Documents/My Pictures/Lightroom/Lightroom 2/3 Catalog Previews.lrdata folder. They are organized and coded for the application to read, not for users.
Windows Vista / Windows 7
The Photoshop Lightroom application is the Lightroom.exe file, located in the Program Files/Adobe/Adobe Photoshop Lightroom 2 folder.
Preferences are located in the Lightroom 2/3 Preferences.agprefs file, located in the Users/[username]/AppData/Roaming/Adobe/Lightroom/Preferences folder.
The Photoshop Lightroom database file, Lightroom 2 Catalog.lrcat, is located in the Users/[username]/Pictures/Lightroom folder.
Previews are located in various folders in the Users/[username]/Pictures/Lightroom/Lightroom 2/3 Catalog Previews.lrdata folder. They are organized and coded for the application to read, not for users.
Lightroom 1.x
This Adobe  TechNote lists the locations for the Photoshop Lightroom 1.x  Preference and Database/Catalog files. The location information provided in the Technote is summarised below:
Mac
>The preference file is the com.adobe.Lightroom.plist file, located in the [username]/Library/Preferences folder.
>The following Photoshop Lightroom database files are located in the [username]/Pictures/Lightroom folder:
* Lightroom Database.lrdb(the Lr 1.0 database)or the Lightroom Catalog.lrcat (Lightroom 1.1 and higher)
* Lightroom Database.lrdb.lock (the file that prevents data from being overwritten inadvertently)
* Lightroom Previews.lrdata (the file that holds the preview data assigned to your photos)
Windows:
>Preferences are located in the Lightroom Preferences.agprefs file, located in the Documents and Settings/[username]/Application Data/Adobe/Lightroom/Preferences folder.
>The following Photoshop Lightroom database file is located in the Documents and Settings/[username]/My Documents/My Pictures/Lightroom folder:
* Lightroom Database.lrdb (Lr 1.0 database) or the Lightroom Catalog.lrcat file (Lightroom 1.1 and higher)
* Lightroom Database.lrdb.lock (the file that prevents data from being overwritten inadvertently)
* Lightroom Previews.lrdata (the file that holds the preview data assigned to your photos)
>Registration information is located in the Windows registry, in the HKEY_LOCAL_MACHINE/Software/Adobe/Lightroom/1.0/Registration key folder for Lr 1.x
Make sure you don't delete any of the database/catalog files. The only file you might need to delete or remove is the preference file.
Note: database files were created by Lightroom version 1.0 and use the extension  lrdb. Subsequent versions use catalog files for the same purpose and have the extension  lrcat

If you don't mind losing some if not all of the work you have done already start a new catalog.
To keep all existing work:
Make sure that the copied NEF files on the external have the same folder structure as previous.
Copy the Lr4 catalog to the external and launch it on the laptop by double clicking it. A copy of the catalog will get upgraded for Lr5. This will retain all your work although you will need to reconnect the Folders in the Catalog by pointing them to the new drive.
You can keep th Catalog on the EHD or move it to the Laptop.....

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