HELP! Both Raid Drives "not readable"

Started Apr 2, 2013 | Discussions
webfrasse
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Re: HELP! Both Raid Drives "not readable"
In reply to Stu 5, Apr 4, 2013

Stu 5 wrote:

webfrasse wrote:

Stu 5 wrote:

webfrasse wrote:

Stu 5 wrote:

Joe Tam wrote:

Hi,

I have a Newertech Guardian Maxiumus with 2x2TB drives in a RAID 1 on Macbook Pro 2011 13" running 10.8.4. I turned on the drive tonight and got the dreaded "The disk you inserted was not readable by this computer." I saw the "rebuild" light blink but the drive indicators did not go red to indicate which drive was dead.

I tried Disk Utility but couldn't see the drives.

I removed the drives and put them in a Black X USB docking station but the same error showed up.

I purchased Disk Warrior but DW doesn't even see the drive.

I finally ran Data Rescue from Prosoft and it has sees the drive in quickscan mode and allowing me to copy files file by file/folder by tolder to a secondary 2 TB drive.

Unfortunately it is going to take about 40 hours and I'm just wondering how Data Rescue is working and DW does not even see the drive.

Do you know if there is any way to get DW to see the drive and get back the data faster?

Do you know what causes this error? Could it be the Newertech Drive? I have the drive in a Sentry Fire safe and I was moving it earlier tonight on the ground. I hope that didn't cause any static buildup. Or maybe the Newertech drive sucks and caused an electric spike.

I'm just trying to get to the bottom of this.

Disk Warrior is not a data recovery program and if you try to use it as one it can actually do more damage than you started with. It is OK at what it does but NEVER use it to try to recover data in this way as you could risk all the data on the drive. What your doing at the moment with Data Recovery is the way to go.

Hmmm...do you know what DW does? You can definitely use it to recover data. I have done it. DW will scan your drive and build a new Catalog file for all the files it can find on the drive. It also compares it to the current catalog that may be partially broken or have numerous other errors. It will then, without writing to the drive, mount the new Catalog and it will look as you have two drives. Using the new Catalog you can browse the drive and copy the files from it to another drive (that is the data rescue part). When you have done that, you can ask DW to try to replace the old catalog with the new one. If that works you're good. If that fails you have more serious problems with the drive and you're happy you copied the files from the temporary mounted catalog.

Data Rescue works differently and is also a tool that should be in your toolbox. I have used that to with great success. Sounds like it's the tool to use in this case.

What brand are the drives inside the unit?

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Mikael

Well aware what it does and this is the one time you don't use it. Any decent data recovery company will tell you the damage it can do though when used for this type of data loss. It can corrupt the data futher. It did on a friends hard drive when it was used. A bad data recovery company will tell you it can be used for this.

DW will only read the drive if it can and won't write anything unless you decide to. The temporary rebuilt desktop is not written anywhere. Just shows what DW could recover. As I also said, in this case DW isn't the tool obviously as it can't see the drive...duh.

Not sure what you did to your friends computer...further damage or what?

Maybe you should also read up on what DW actually does, http://www.alsoft.com/diskwarrior/

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Mikael

First of all I did not use DW on the computer. Someone else did. The I.T department of a college. As soon as I knew that had been used I knew it would be an issue. It took a data recovery company to recover the data and when I say data recovery company I don't mean a computer shop pretending to be one. All this company does is recover data and their clients are worldwide. As soon as they got it they asked what had been used to try to recover data and then added 'please don't say DW'. Also even the local Apple store says there are times when you use DW and times when you don't and if you do it can make things worse. I am well aware of what DW does but you might not be or rather what can happen when it should have not been used?

I'm well aware of what DW does, and what DR and Drive Genius from the same vendor. I work in IT and have personal experience of all these tools in data recovery and fixing failed drives. Not hearsay, first hand personal experience.

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Mikael

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Doug R
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Re: HELP! Both Raid Drives "not readable"
In reply to Joe Tam, Apr 4, 2013

Maybe someday you'll have a failure that DW will solve and you'll get your moneys worth. However hope this dose not happen and you have to eat the $109 forever you've gone through enough pain already.

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Joe Tam
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Re: HELP! Both Raid Drives "not readable"
In reply to Doug R, Apr 5, 2013

I fell for the broad claims that diskwarrior site makes.  claims like:

"DiskWarrior recovers your files including your photos, music and videos.DiskWarrior is the safest, most technologically advanced, most powerful utility to eliminate directory damage and recover your files, folders and documents. DiskWarrior is so advanced it can even recover your data from a failing hard drive. Yet all that power is hidden behind one button."

It's kind of useless if it can't even see the drive.

Questions like "How does DiskWarrior recover data no one else can?" on their site are very broad but once again useless if Diskwarrior can't even see the drive.

useless if Diskwarrior can't even see the drive.DiskWarrior is the only product that finds all of your data.":  Claims such "

"You'll save money buying DiskWarrior first.":  once again useless if Diskwarrior can't even see the drive.

"DiskWarrior cures those cryptic errors reported by Disk Utility.":  once again useless if Diskwarrior can't even see the drive.

Doug R wrote:

Maybe someday you'll have a failure that DW will solve and you'll get your moneys worth. However hope this dose not happen and you have to eat the $109 forever you've gone through enough pain already.

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Doug

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Jacques Cornell
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Toolbox needs hammer, screwdriver AND pliers
In reply to Joe Tam, Apr 5, 2013

I know you're skeptical about DW, but I think the lesson to take away from this is that it's worthwhile to have more than one tool in your toolbox. At various times, some utilities may see a damaged drive when others cannot, and this may change from incident to incident.

About DW, I've recovered files with DW when other utilities couldn't even see the drive. I'm skeptical of others' claims that DW will damage a drive if you try to recover data. I've used DW for many, many years for routine maintenance and damage control. On the rare occasions when it's encountered severe data corruption, it's always stopped short of replacing the directory, warned of possible data loss and prompted me to use the new directory - stored in memory and not written to the disk - to copy files to another drive. Again, the reconstituted directory is not written to the drive. It is kept in RAM and used to locate the files on the damaged drive. This is very effective for locating files which are not damaged but which the system cannot locate due to directory corruption. For situations where the corruption extends beyond the directory into the actual data files themselves, you'll need other tools. But, in the majority of cases where the system cannot locate a file, this is due to directory damage, which is DW's specialty.

For more extensive damage, there's also Drive Genius, and TechTool. All three have served me well at various times over the years, but no one utility solves every issue. I still run DW every few weeks, as it finds and fixes minor directory damage caused by power loss, forced restarts, or improper disconnection of drives before it accumulates into a serious problem.

Also, I've always felt that RAID 1 was pretty useless. If you accidentally delete a file, it's instantly gone from both drives. If the enclosure fails, you've lost access to both drives, at least temporarily. And, rebuilding a failed drive takes as long as simply copying data back from a separate backup drive. Better to have two separate drives, one backing up the other with enough of a delay than an accidental deletion can be noticed and reversed before it migrates to the backup.

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webfrasse
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Re: HELP! Both Raid Drives "not readable"
In reply to Joe Tam, Apr 5, 2013

Joe Tam wrote:

I fell for the broad claims that diskwarrior site makes.  claims like:

"DiskWarrior recovers your files including your photos, music and videos.DiskWarrior is the safest, most technologically advanced, most powerful utility to eliminate directory damage and recover your files, folders and documents. DiskWarrior is so advanced it can even recover your data from a failing hard drive. Yet all that power is hidden behind one button."

It's kind of useless if it can't even see the drive.

Questions like "How does DiskWarrior recover data no one else can?" on their site are very broad but once again useless if Diskwarrior can't even see the drive.

useless if Diskwarrior can't even see the drive.DiskWarrior is the only product that finds all of your data.":  Claims such "

"You'll save money buying DiskWarrior first.":  once again useless if Diskwarrior can't even see the drive.

"DiskWarrior cures those cryptic errors reported by Disk Utility.":  once again useless if Diskwarrior can't even see the drive.

I have never seen that situation but then again I have never ripped out a single drive from a raid configuration. It's a special case and it's also the reason I don't use raid configurations. You're left with proprietary vendor drivers/configurations and in the mercy of the vendors support.

I have used both DW and DR for years. They solve different problems and I use as such. Everything you quoted above is true in my experience but of course, if the drive doesn't mount nothing works. DR takes another approach. It doesn't try to rebuild the drive. Just recover files it can find. You then have to use other tools to format the drive (if you thinks the issue was something other than a hw failure).

I use DW in a regular maintenance workflow. I will rebuild my drives with DW once or twice a year. This is a non-destructive process that keeps the drive (the file system) healthy and problem free.

Doug R wrote:

Maybe someday you'll have a failure that DW will solve and you'll get your moneys worth. However hope this dose not happen and you have to eat the $109 forever you've gone through enough pain already.

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Mikael

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Joe Tam
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Re: HELP! Both Raid Drives "not readable"
In reply to webfrasse, Apr 5, 2013

Thanks.  I formatted the drive that was displaying the errors now that I restored the data.  Is there any way to tell if it was a physical error?  I ran test disk and I think it was a partition map error?  Can formatting the drive restore the drive?  Or should I just send them back to Hitachi under warranty?

Thanks.

webfrasse wrote:

Joe Tam wrote:

I fell for the broad claims that diskwarrior site makes.  claims like:

"DiskWarrior recovers your files including your photos, music and videos.DiskWarrior is the safest, most technologically advanced, most powerful utility to eliminate directory damage and recover your files, folders and documents. DiskWarrior is so advanced it can even recover your data from a failing hard drive. Yet all that power is hidden behind one button."

It's kind of useless if it can't even see the drive.

Questions like "How does DiskWarrior recover data no one else can?" on their site are very broad but once again useless if Diskwarrior can't even see the drive.

useless if Diskwarrior can't even see the drive.DiskWarrior is the only product that finds all of your data.":  Claims such "

"You'll save money buying DiskWarrior first.":  once again useless if Diskwarrior can't even see the drive.

"DiskWarrior cures those cryptic errors reported by Disk Utility.":  once again useless if Diskwarrior can't even see the drive.

I have never seen that situation but then again I have never ripped out a single drive from a raid configuration. It's a special case and it's also the reason I don't use raid configurations. You're left with proprietary vendor drivers/configurations and in the mercy of the vendors support.

I have used both DW and DR for years. They solve different problems and I use as such. Everything you quoted above is true in my experience but of course, if the drive doesn't mount nothing works. DR takes another approach. It doesn't try to rebuild the drive. Just recover files it can find. You then have to use other tools to format the drive (if you thinks the issue was something other than a hw failure).

I use DW in a regular maintenance workflow. I will rebuild my drives with DW once or twice a year. This is a non-destructive process that keeps the drive (the file system) healthy and problem free.

Doug R wrote:

Maybe someday you'll have a failure that DW will solve and you'll get your moneys worth. However hope this dose not happen and you have to eat the $109 forever you've gone through enough pain already.

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Doug

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Mikael

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Jacques Cornell
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Secure erase / surface scan
In reply to Joe Tam, Apr 5, 2013

Joe Tam wrote:

Thanks.  I formatted the drive that was displaying the errors now that I restored the data.  Is there any way to tell if it was a physical error?  I ran test disk and I think it was a partition map error?  Can formatting the drive restore the drive?  Or should I just send them back to Hitachi under warranty?

If it's under warranty, yes, I'd send it in for replacement. Now, there's one other thing you can do to protect yourself when you get a new drive or to repair a drive that may have damage on the platters, and that's to do a "secure erase". I do this on every new drive I get before I put it into service. You see, the magnetic recording material on a platter may have or develop over time defects at some physical locations which render it unable to reliably record bits of data at those locations. Doing a secure erase forces the drive to write and test data at every single bit. When the drive finds a bit that cannot be switched back and forth between 1 and 0, it logs that location and removes it from the map of blocks available for storing data. On a Mac, you can use Disk Utility to do a Secure Erase, or you can use a utility like Drive Genius or TechTool Pro to do a "surface scan".

Most data "loss" is simply corruption of the directory file that tells the OS where files are stored. However, when directory repair doesn't work and a drive is hosed, I've found on occasion that, after recovering the data, I could restore a drive to service by performing this secure erase / surface scan.

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