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Function for periodically occurring bad bits in FC2279 -Idea
http://forum.hddguru.com/viewtopic.php?f=27&t=44551		 Page 1 of 1
Author:  Gregory [ August 5th, 2024, 8:46 ]
Post subject:  Function for periodically occurring bad bits in FC2279 -Idea
Hello, have you had any experience with periodically occurring bad bits in a damaged plane? We have a new case based on the FC2279 controller, the problem is that the block has 1536 bad bits, cutting them out manually is time-consuming and it could be done with one mouse click after entering 2 parameters in VNR - the location of the first bad bit and the period of occurrence.

Below you will find an example in the screenshot I have attached: in our case, the first bad bit column is in position 13, the next ones are 109, 205, 301... etc. so the period is 96 bits.

I think it's nice that a function has been implemented in VNR that will do it for us automatically.
Is it possible to develop such a function in VNR?

ps. after removing these bad bits, I have ECC and I can see the data, so it is not a garbage block.

Best regards.

Attachments:
FC2279_bad_bit_period.jpg
FC2279_bad_bit_period.jpg [ 576.45 KiB | Viewed 10953 times ]
Author:  Igor_Loskutov [ August 6th, 2024, 12:22 ]
Post subject:  Re: Function for periodically occurring bad bits in FC2279 -
That is impressive that you removed 1536 bad bits manually :shock:
I think if we meet more such cases, we'll do it.
Author:  fayn [ August 9th, 2025, 3:57 ]
Post subject:  Re: Function for periodically occurring bad bits in FC2279 -
I have one such case, too.

But my current problem is that I cannot get bBCR to work in VNR 9. No matter how many or which bits I remove, the dump stays 100% identical. BCR working fine.

:?
Author:  arvika [ August 9th, 2025, 5:33 ]
Post subject:  Re: Function for periodically occurring bad bits in FC2279 -
bBCR was change methodology at this version as I remember. Ask support, as I remember there was some video or article.
Author:  pepe [ August 10th, 2025, 12:43 ]
Post subject:  Re: Function for periodically occurring bad bits in FC2279 -
i think you could write a script to generate the textual description of the bad bits and load it into vnr. Probably you need to copy it into the task xml.
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