This message is from the T13 list server.
Hale,
We use it force an error on a drive in a specific location.
Then we can test out a number of drive features to make sure it responds
appropriately, including (but not limited too):
1) Smart values
2) Forced reallocation
3) Read right before and right after the bad sector
(should return good data and good status)
4) Validate read-ahead and read-behind algorithms
5) Drive Self Test verification
I'm sure there are more....
Jeff
> -----Original Message-----
> From: Hale Landis [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, March 12, 2002 11:10 AM
> To: [EMAIL PROTECTED]; sraposo
> Subject: Re: [t13] Read/Write Long
>
>
> This message is from the T13 list server.
>
>
> On Tue, 12 Mar 2002 07:34:16 -0300, sraposo wrote:
> >This message is from the T13 list server.
> >If someone could answer, I'd like to ask the reason why
> read/write long was
> >supressed from ATA-4 on and if it would be possible to these
> commands become
> >available again.
>
> Can you explain why you think you need R/W Long? Do you think it can
> be used to read sectors that have uncorrectable ECC errors in hopes
> of recovering some of the data (BAD IDEA)? Do you think these
> commands actually can test the extrememly complex ECC algorithms used
> in today's disk drives (IT CAN NOT)?
>
> The commands were removed for two reasons... The are ineffective on
> today's drives and they have a PIO Data In/Out protocol that was
> never documented and is slightly different from the standard PIO Data
> In/Out protocol.
>
>
>
> *** Hale Landis *** www.ata-atapi.com ***
>
>
>
>
