Q: "No Entry" sign, disk repaired, but ...

Hello,

have a MacBook Air 1st Gen with Snow Leopard installed.

Have got the "no entry" sign, and have repaired the disk through disk utility.

however, if I verify the disk again, I get the same error "invalid content in journal" and I get the 'no entry' again.

what should I do? Would restoring from time machine solve the issue?

would lose the last week of data, though.

thanks!

MacBook Air

Posted on Dec 14, 2014 11:24 AM

I have this question too

Solved

Grant Bennet-Alder

Level 9 (61,026 points)

Desktops

The article explains why TRIM is important.

TRIM Enabler will NEVER be in The Mac App Store, because it works by modifying Apple software. The developer also cannot charge money for the basic TRIM Enabler function, or Apple will sue him out of business.

TRIM Enabler works by undoing the intolerable decision Apple has taken is supporting TRIM ONLY for Apple branded devices. Since the code is in-line, the only solution a regular developer can make is to patch the Apple software. (Re-writing the entire module that code appears in from scratch without using any Apple code is mind-bogglingly complex, and out of the question.) Since Apple implemented that decision, they have discontinued selling add-on SSDs entirely, but have continued to not allow support for any third-party SSDs. So hobbyists have resorted to methods such as patching Apple software.

The developer of the TRIM Enabler package (free of pay-for-extra-features) is a Registered Developer, his Applications are signed, and he produces a high-quality product.

http://www.cindori.org/software/trimenabler/

Posted on Dec 17, 2014 5:52 PM

Q: "No Entry" sign, disk repaired, but ...

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Page 1

by Grant Bennet-Alder,

Grant Bennet-Alder Dec 14, 2014 11:27 AM in response to older_balder
Level 9 (61,026 points)

Desktops

Dec 14, 2014 11:27 AM in response to older_balder

Mac OS X: Gray screen or prohibitory sign appears during startup - Apple Support
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by older_balder,

older_balder Dec 14, 2014 12:48 PM in response to Grant Bennet-Alder
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Dec 14, 2014 12:48 PM in response to Grant Bennet-Alder

Thank you.

Have gone down till the installation section.
despite having the disk visible in disk utility, the box where I should choose where to install OS X is empty?!?

not sure what to do now, it looks like the issue is that 512 bytes of the journal header cannot be read.
rrestore from time machine backup?
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by older_balder,

older_balder Dec 14, 2014 2:09 PM in response to older_balder
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Dec 14, 2014 2:09 PM in response to older_balder

More info: It looks like the volume is not active and cannot be activated
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by Grant Bennet-Alder,

Grant Bennet-Alder Dec 14, 2014 2:20 PM in response to older_balder
Level 9 (61,026 points)

Desktops

Dec 14, 2014 2:20 PM in response to older_balder

Boot to Recovery or use your DVD to run Disk Utility and ( Repair Disk ).
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by older_balder,

older_balder Dec 14, 2014 2:46 PM in response to Grant Bennet-Alder
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Dec 14, 2014 2:46 PM in response to Grant Bennet-Alder

HHave used Snow Leopard installation disk to run what I described (sharing a PC's DVDs) ... Including repair disk.
WHat do you mean with "boot to recovery"?
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by older_balder,

older_balder Dec 14, 2014 3:05 PM in response to older_balder
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Dec 14, 2014 3:05 PM in response to older_balder

... I'm afraid boot to recovery is not available with snow leopard (only from lion onwards)

do you think I could try restore from a backup?

or the disk is gone?
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by older_balder,

older_balder Dec 14, 2014 3:15 PM in response to older_balder
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Dec 14, 2014 3:15 PM in response to older_balder

HHave tried to restore. It doesn't see the disk!
this is strange, as the disk is visible in disk utility, but also when I boot via the DVD, I see that as an alternative.

should I re initialise and then restore?
would you say the disk is physically damaged?
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by Grant Bennet-Alder,

Grant Bennet-Alder Dec 15, 2014 4:57 AM in response to older_balder
Level 9 (61,026 points)

Desktops

Dec 15, 2014 4:57 AM in response to older_balder

Is this a third party SSD?

Is this a drive that has a Windows partition?
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by older_balder,

older_balder Dec 15, 2014 5:12 AM in response to Grant Bennet-Alder
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Dec 15, 2014 5:12 AM in response to Grant Bennet-Alder

Hai have replaced the SSD with the very same model from Samsung, but with no'apple' logo on it (as suggested in the apple store, given that they no longer support it). No windows or other partitions.

Right now! I have turned the mac on, and a progress bar appeared. At completion, it started as nothing has happened!
now backing up

really puzzling to me
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by older_balder,

older_balder Dec 15, 2014 5:13 AM in response to older_balder
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Dec 15, 2014 5:13 AM in response to older_balder

CCould the issue be caused by me leaving the mac on and connected to power overnight? Maybe a habit I should give up?
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by Eric Root,

Eric Root Dec 15, 2014 7:33 AM in response to older_balder
Level 9 (71,882 points)

iTunes

Dec 15, 2014 7:33 AM in response to older_balder

No, that shouldn't cause the problem. When booted from the DVD have you run Disk Utility/Repair Disk until there were no errors? What was the result?
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by older_balder,

older_balder Dec 16, 2014 5:57 AM in response to Eric Root
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Dec 16, 2014 5:57 AM in response to Eric Root

Yes, I run Disk Utility - it detected errors (invalid journal content) and supposedly repaired it.
Before rebboting, I run the check again, it found the same error and supposedly repaired it ... and again and again.
Same issue when rebooting ... till it started working again?

Maybe some sw update that messed up things?
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by Grant Bennet-Alder,

Grant Bennet-Alder Dec 16, 2014 6:46 AM in response to older_balder
Level 9 (61,026 points)

Desktops

Dec 16, 2014 6:46 AM in response to older_balder

One issue with third-party SSD drives is that Apple has disabled TRIM support for non-Apple drives. Since Apple no longer sells replacement Apple branded drives, I find this position untenable.

The solution for many users had been to use a free Utility like TRIM Enabler, which patches Mac software to restore TRIM.

TRIM is especially important when the drive is used for everything, such as in a MacBook.

https://en.wikipedia.org/wiki/Trim_(computing)
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by older_balder,

older_balder Dec 17, 2014 1:52 AM in response to Grant Bennet-Alder
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Dec 17, 2014 1:52 AM in response to Grant Bennet-Alder

Thanks!

I didn't understand from the wikipedia article whether TRIM is already supported with OS X 10.6.8 Snow Leopard.
And I couldn't find the TRIM Enabler on the AppStore.

Would you suggest to install it, and if yes, where can I find it?
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