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 Post subject: How to hide first Sectors on hdd ?
PostPosted: September 26th, 2018, 13:53 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
So i have the drive that have right from the 0 LBA couple
bad sectors, and the rest of the drive is fine/smooth.
I had an idea to Cut the first few Gig with DCO or HPA and
then use as usual. But i tried HPA, and it cuts drive from the
back[ with hdat2].

Q: Is it possible and how to hide area Starting from 0 LBA ?

Thanks.


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: September 26th, 2018, 16:36 
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Joined: September 8th, 2009, 18:21
Posts: 15461
Location: Australia
The ATA standard provides an "address offset" feature, but I believe that these settings are volatile, ie they don't survive a power cycle. In any case, not all drives support this feature.

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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: September 27th, 2018, 1:29 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
Thanks,
will look into it.


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: September 27th, 2018, 4:44 
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Joined: September 30th, 2005, 7:33
Posts: 849
For different brands it's different. No easy solution.


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: September 27th, 2018, 16:27 
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Joined: September 8th, 2009, 18:21
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Location: Australia
BGman wrote:
For different brands it's different. No easy solution.

IIUC, the OP is looking for a universal method using standard ATA commands, not VSCs.

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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: September 27th, 2018, 22:29 
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Joined: December 9th, 2010, 2:59
Posts: 241
Location: kolkata
in 1990 we used to use pctools for skipping 0 sectors.

But now have completly forgotten the procedure. Anyone can remember now????????????????


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: September 28th, 2018, 2:56 
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Location: Australia
longlife wrote:
in 1990 we used to use pctools for skipping 0 sectors.

If you had an MFM drive, then you would have had to low level format it and enter the defects manually. These were printed on the label.

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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: October 16th, 2018, 6:27 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
HDD is HGST 500GB 5400RPM Z5K500-500 HTS545050A7E680
At starting mhdd, i getting for 30secs
"error reading partition table drive 01 sector 0".
I did try couple of times mhdd.erase and some of the lba at
beginning changed from UNC to "red".
Also to confirm that the rest of the disk is <3ms read.
I would like to learn, and this hdd is good for practicing, so
i will try your good suggestions. Thanks


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: November 17th, 2018, 6:35 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
Did secure erase using PMagic and it went well, but
then booted into mhdd, and on F2 says that
'ATA Password locked'.


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: November 17th, 2018, 6:40 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
hdat2 says security/enabled/high


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: November 17th, 2018, 6:57 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
Gsmartcontrol says "ATA Security ENABLED, PW level HIGH, **LOCKED** [SEC4]" and
in dialog for 'secure erase' "not frozen"


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: November 17th, 2018, 7:24 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
Unlocked device unsing hdat2 permanently, but now
now each sector shows error when i try to
F4 with mhdd. Before when i started scan from
100mil.lba scan was smooth at 110mb/s and no
slow sectors.
Is it a heads ?
Can i do something with that or only with the
special tools ?


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: November 17th, 2018, 11:11 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
I did Shift+F2 = Unlocked [ did after power-cycle]
I keep detailed log of every step, so i have a record
of scanning with mhdd starting from 700mil.lba and
it did run smooth, and after ATA SE strait from 700
each lba 'Error'=UNC, but then i set 800m.lba and
it's ok. Not worrying about this disk= practicing on it, but
it looks like some parts of the hdd is ok and other
just UNC.
So i just want to understand, is it surface, heads ?


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: November 17th, 2018, 12:50 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
Ok, thanks for lessons.

HGST 500GB 5400RPM Z5K500-500 HTS545050A7E680 - for parts/donnor


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: November 17th, 2018, 14:54 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
You are right,
i got this hdd in that state[ for free] and
not sure if it can revived. So i will
not try to do anything more with repair.


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 Post subject: Re: How to hide first Sectors on hdd ?
PostPosted: November 20th, 2018, 13:11 
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Joined: April 6th, 2014, 5:59
Posts: 78
Location: ukraine
SOLD as donor pcb.
Thread is Done.


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