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<blockquote data-quote="miguelfh" data-source="post: 1323359" data-attributes="member: 222426">hi..i have been searching for the same problem in the forum but i can't find any answers...- late 2008 macbook 2.4 Ghz Intel Core 2 Duo&nbsp; on&nbsp; OSX 10.7.2- 3TB WD My Book EssentialThe problem began one night i left my mac on all night.. the next morning my external hd was missing..-&nbsp; when i connect it i shows up in Disk Utility but DISSAPEARS AFTER 30&nbsp;&nbsp; SECONDS OR A MINUTE.. it shows up with the name i assigned months ago.. &quot;Media 3TB&quot;(grey) below the &quot;3TB WD My Book 1130 Media&quot;&nbsp; but no icon shows up in the Desktop or FinderThere appears to be nothing wrong with it, externally, i.e. the drives spin up, and the LED lights show activity when I plug the USB cable to the Macbook and pull it out again.heres what i have tried 1)I repaired permissions of my mac and the ones from the disk &quot;3TB WD My Book 1130 Media&quot; which seems to be able to repair in the 1 minute window..&nbsp; but when i try to repair permissions of the partition &quot;Media 3TB&quot; it disappears after a minute or so .....2)rebooted my mac a few times&nbsp;3)I disconnected the USB cable on both the WD and on the Macbook, and reconnected several times. i also tried another power source for the HD4)I tried all the USB ports on the Macbook.5)connected the WD drive to a Windows.. i recognizes that a hardware has been connected but it doesn't shows up... (i suppose its because its formatted for mac)6) Tried Disk Warrior... but it can't see the drive when i connect it..after all this.. i downloaded the WD official software.. i installed it in my mac and connected my HD... it recognized a HD but didn't mount it.. after a minute.. it disappeared.. (note. When i have the WD software, the disk utility can't see the drive at all so i uninstalled it)This is the INFO from Disk utility...&nbsp; &nbsp; Name :&nbsp; &nbsp;&nbsp; Media 3TB&nbsp; &nbsp; Type :&nbsp; &nbsp;&nbsp; Partition&nbsp; &nbsp; Disk Identifier :&nbsp; &nbsp;&nbsp; disk3s1&nbsp; &nbsp; Mount Point :&nbsp; &nbsp;&nbsp; Not mounted&nbsp; &nbsp; File System :&nbsp; &nbsp;&nbsp; Mac OS Extended (Journaled)&nbsp; &nbsp; Connection Bus :&nbsp; &nbsp;&nbsp; USB&nbsp; &nbsp; Device Tree :&nbsp; &nbsp;&nbsp; IODeviceTree:/PCI0/EHC1@1D,7&nbsp; &nbsp; Writable :&nbsp; &nbsp;&nbsp; Yes&nbsp; &nbsp; Universal Unique Identifier :&nbsp; &nbsp;&nbsp; xxxxxxxxxxxxxxxxxxxxxxx&nbsp; &nbsp; Capacity :&nbsp; &nbsp;&nbsp; 3 TB (3,000,214,966,272 Bytes)&nbsp; &nbsp; Owners Enabled :&nbsp; &nbsp;&nbsp; No&nbsp; &nbsp; Can Turn Owners Off :&nbsp; &nbsp;&nbsp; Yes&nbsp; &nbsp; Can Be Formatted :&nbsp; &nbsp;&nbsp; Yes&nbsp; &nbsp; Bootable :&nbsp; &nbsp;&nbsp; Yes&nbsp; &nbsp; Supports Journaling :&nbsp; &nbsp;&nbsp; Yes&nbsp; &nbsp; Journaled :&nbsp; &nbsp;&nbsp; No&nbsp; &nbsp; Disk Number :&nbsp; &nbsp;&nbsp; 3&nbsp; &nbsp; Partition Number :&nbsp; &nbsp;&nbsp; 1( Note the &quot;Owners Enabled :&nbsp; &nbsp;&nbsp; No&quot;I have very important info in here.. please someone help me.... :Si found a similar problem but in that case the hard drive don't disappears.....<a href="http://forums.macrumors.com/showthread.php?t=1124442" target="_blank">External Hard drive shows in Disk Utility, but not in Finder - MacRumors Forums</a>...i will be happy to donate by paypal to anyone how can solve this..</blockquote>

[QUOTE="miguelfh, post: 1323359, member: 222426"] hi.. i have been searching for the same problem in the forum but i can't find any answers... - late 2008 macbook 2.4 Ghz Intel Core 2 Duo on OSX 10.7.2 - 3TB WD My Book Essential The problem began one night i left my mac on all night.. the next morning my external hd was missing.. - when i connect it i shows up in Disk Utility but DISSAPEARS AFTER 30 SECONDS OR A MINUTE.. it shows up with the name i assigned months ago.. "Media 3TB"(grey) below the "3TB WD My Book 1130 Media" but no icon shows up in the Desktop or Finder There appears to be nothing wrong with it, externally, i.e. the drives spin up, and the LED lights show activity when I plug the USB cable to the Macbook and pull it out again. heres what i have tried 1)I repaired permissions of my mac and the ones from the disk "3TB WD My Book 1130 Media" which seems to be able to repair in the 1 minute window.. but when i try to repair permissions of the partition "Media 3TB" it disappears after a minute or so ..... 2)rebooted my mac a few times 3)I disconnected the USB cable on both the WD and on the Macbook, and reconnected several times. i also tried another power source for the HD 4)I tried all the USB ports on the Macbook. 5)connected the WD drive to a Windows.. i recognizes that a hardware has been connected but it doesn't shows up... (i suppose its because its formatted for mac) 6) Tried Disk Warrior... but it can't see the drive when i connect it.. after all this.. i downloaded the WD official software.. i installed it in my mac and connected my HD... it recognized a HD but didn't mount it.. after a minute.. it disappeared.. (note. When i have the WD software, the disk utility can't see the drive at all so i uninstalled it) This is the INFO from Disk utility... Name : Media 3TB Type : Partition Disk Identifier : disk3s1 Mount Point : Not mounted File System : Mac OS Extended (Journaled) Connection Bus : USB Device Tree : IODeviceTree:/PCI0/EHC1@1D,7 Writable : Yes Universal Unique Identifier : xxxxxxxxxxxxxxxxxxxxxxx Capacity : 3 TB (3,000,214,966,272 Bytes) Owners Enabled : No Can Turn Owners Off : Yes Can Be Formatted : Yes Bootable : Yes Supports Journaling : Yes Journaled : No Disk Number : 3 Partition Number : 1 ( Note the "Owners Enabled : No" I have very important info in here.. please someone help me.... :S i found a similar problem but in that case the hard drive don't disappears..... [url=http://forums.macrumors.com/showthread.php?t=1124442]External Hard drive shows in Disk Utility, but not in Finder - MacRumors Forums[/url]... i will be happy to donate by paypal to anyone how can solve this.. [/QUOTE]

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