Apple MD094LL/A manual Hard Drive Read/Write Errors, Go to Optical Drive Read

11.If restore from Install DVD is unsuccessful, startup a known- good Intel Mac system with

T key pressed (to enter Target Disk Mode), insert the iMac Install DVD in its optical drive and connect it to the user’s system via a FireWire cable. Startup user’s system while holding Option key, then select and boot from the Install Disc DVD and restore system software. Verify if software restore was successful.

Yes	Restore failure seems to be
	due to customer’s internal
	optical drive or media issue.
	Go to Optical Drive Read/
	Write Error symptom flow.
No	Restore failure seems to be	M19
	due to internal SATA bus
	issue. Replace logic board.

Hard Drive Read/Write Errors

Unlikely cause: LCD panel, power supply, fans, speakers, camera, microphone

Quick Check

Symptoms		Quick Check
Drive Read/Write Error		1.	Boot from Install DVD. Use Disk Utility to verify
Drive Bad Sector/Defective			S.M.A.R.T. status of internal drive(s).
Drive Formatting Issues		2.	Use Disk Utility to repair disk.(s)
•	Cannot save documents
		3.	Verify that user’s data is backed up and that user
•	Read/write error message
			authorizes erasing disk and reinstalling software.
• Hang when accessing or saving
		4.	Use Target Disk Mode to mount user’s drive(s) on
	data
			a known-good computer. Use Disk Utility on host
			computer for Quick Checks 2 through 3.

Deep Dive

Check		Result	Action	Code
1.	Run Disk Utility ‘Repair Disk’	Yes	Go to step 2.
	function, and verify if it
		No	Go to step 3.
	completes successfully.
2.	Reboot computer. Verify if	Yes	Data error. Issue resolved.	H07
	system boots successfully and
	that Disk Utility “Verify” function	No	Go to step 3.
	reports no errors.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Mass Storage  72