Are a disk's bad sectors marked while formatting?

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"yukuan" <yukuan.jiang@gmail.com> wrote in message
news:1119723267.948141.224470@g49g2000cwa.googlegroups.com...
> Are a disk's bad sectors marked while formatting?

The simple answer is yes. But I suspect you need to ask a more precise
question.   What do you have in mind when you say "bad sectors marked "?

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I means it recording which sector is bad in the FAT, while formatting
with fat16, fat32 etc.

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"yukuan" <yukuan.jiang@gmail.com> wrote in message
news:1119724277.788790.61400@g14g2000cwa.googlegroups.com...
> I means it recording which sector is bad in the FAT, while formatting
> with fat16, fat32 etc.

In general on a modern HD there should be no bad sectors.

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How about the virtual HD, flash pendrive?

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Yes. FORMAT is who creates the new empty FS volume, the bad blocks are
marked during this.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

"yukuan" <yukuan.jiang@gmail.com> wrote in message
news:1119723267.948141.224470@g49g2000cwa.googlegroups.com...
> Are a disk's bad sectors marked while formatting?
>

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THX all you for these response.
I still have some questions:
How does FORMAT decide that a block is bad?
Does It use the procedure of write, read and compare.
or just decide bad block via got a action-fail message from the
storage's controller?

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"yukuan" <yukuan.jiang@gmail.com> wrote in message
news:1119764390.690762.268870@g43g2000cwa.googlegroups.com...
> THX all you for these response.
> I still have some questions:
> How does FORMAT decide that a block is bad?

Writes it and sees if it can be read.

> Does It use the procedure of write, read and compare.

Right but I don't think there's a compare.

> or just decide bad block via got a action-fail message from the
> storage's controller?

That happens on a write fail and a read fail.  The read fail is the usual
case.

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Still,
during the lifetime after FORMAT, what's going on if the storage gets
new bad blocks?
Will these bad blocks be recorded?

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"yukuan" <yukuan.jiang@gmail.com> wrote in message
news:1119767127.694486.251990@g43g2000cwa.googlegroups.com...
> Still,
> during the lifetime after FORMAT, what's going on if the storage gets
> new bad blocks?

Mostly the drive detects a block going bad before it's completely
unreadable.  The drive flaws(replaces it with a good one) the sector and you
never see a thing.  Occasionally if the sector goes bad while it's holding
file data then the file will become unreadable and the sector show up as a
visible bad sector.  When many visible bad sectors start showing then the
drive is likely about to die.

> Will these bad blocks be recorded?

"recorded"?

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