These AppleScripts are related to this hint. Both can already be found in the replies to the hint topic post, but I'm resubmitting them so that they will appear together.
The first is an improved version of the original AppleScript which presents a dialog box from which a selection of local volumes to be ejected can be made. An example of its usefulness might be that it provides a reliable method for quickly ejecting a MacBook's mounted local volumes for users on the go. I've configured it as a "Run AppleScript" step for an Automator-based Mac OS X Service called "Unmounter" and assigned it the keyboard shortcut of (Command-Control-Shift-E) in System Preferences on my system.
The second is a more robust version of the AppleScript included in my first reply to the original hint topic. It attempts to automatically unmount all unmountable local volumes, and if it finds none, attempts to mount any local volumes that are available. I've configured it as a "Run AppleScript" step for an Automator-based Mac OS X Service called "Toggle Available Local Volumes" and assigned it the keyboard shortcut (Command-Option-Control-Shift-E) in System Preferences on my system.
For both Automator-based Mac OS X Services that I created to provide key triggers for the AppleScripts, the scope specified is "Service receives no input in any application."
set alldisks to paragraphs of (do shell script "df -hlg | awk -F/ '/disk*/ {print $5}'")
set nonbootnumber to (count of alldisks)
try
set alldisks to items 2 thru nonbootnumber of alldisks
activate
set your_selected_device_id to choose from list alldisks with prompt "Please choose one or more volumes to be unmounted." with multiple selections allowed
repeat with the_Item in your_selected_device_id
set the_ID to (do shell script "df -hlg | grep -m 1" & space & quoted form of the_Item & space & "| grep -o 'disk[0-9][a-z][0-9]*'")
try
do shell script "diskutil unmount /dev/" & the_ID
on error the error_message number the error_number
display dialog "Error: " & the error_number & ". " & the error_message buttons {"OK"} default button 1
end try
end repeat
on error the error_message number the error_number
if the error_number is -128 or the error_number is -1708 then
else
display dialog "There are no unmountable volumes." buttons {"OK"} default button 1
end if
end try
set alldisks to paragraphs of (do shell script "df -hlg | awk -F/ '/disk*/ {print $5}'")
set nonbootnumber to (count of alldisks)
try
set all_non_boot_disks to items 2 thru nonbootnumber of alldisks
on error
set all_non_boot_disks to {}
end try
if (count of all_non_boot_disks) > 0 then
try
activate
repeat with the_Item in all_non_boot_disks
set the_ID to (do shell script "df -hlg | grep -m 1" & space & quoted form of the_Item & space & "| grep -o 'disk[0-9][a-z][0-9]*'")
try
do shell script "diskutil unmount /dev/" & the_ID
on error the error_message number the error_number
display dialog "Error: " & the error_number & ". " & the error_message buttons {"OK"} default button 1
end try
end repeat
on error the error_message number the error_number
if the error_number is -128 or the error_number is -1708 then
else
display dialog "There are no unmountable volumes." buttons {"OK"} default button 1
end if
end try
else
set actiondisks to {}
set allvols to paragraphs of (do shell script "diskutil list -plist | grep -o 'disk[0-9][a-z][0-9]*'")
repeat with i in allvols
if i is not in actiondisks then
set actiondisks to actiondisks & i
end if
end repeat
repeat with myitem in actiondisks
try
do shell script "diskutil mountDisk /dev/" & myitem
end try
end repeat
end if
Mac OS X Hints
http://hints.macworld.com/article.php?story=20120514064909940