To make an invisible file or folder visible, open use File Get Info to select the item in question and then use the resulting Info window to make the item visible.

You can use the following process to restore the visibility of a volume if you made it invisible by setting its Invisible flag:

1. Open the Find window.
2. Select the invisible volume in the search list.
3. Configure the search to find items whose name is exactly the name of the volume.
4. Click Search. Once the search completes and the results are displayed in a List window, the invisible volume should be in the list of found items.
5. Control-click the volume’s icon in the list to open a contextual menu.
6. Choose Make Visible from the menu.
7. You may need to use the Cleaning Restart Finder command for the change to take effect. You can also press the Option key while clicking Finder’s dock item and choose the option to Relauch.

Items whose names begin with a period '.' are always invisible in Mac OS X because this is how UNIX designates a file should not be shown to the user. This takes precedence over the Finder's Invisible flag, so changes to that flag will never make one of these items visible. Most items whose names start with a period are system files and should not be renamed.