[Disksim-users] Negative transfer time in Seagate Cheetah 15k.5 disk spec

[weafon]

Hi,

I have the same query about the negative transfer time. A negative value 
seems to lead the zero transfer time when the bus transfer time is zero.

I think the time should approximate 0.005 ms

According to the spec of the hard disk: 
http://www.seagate.com/docs/pdf/datasheet/disc/ds_cheetah_15k_5.pdf ,
the sustained transfer rate of SEAGATE_ST3146855FC is between 73 to 125. 
If we assume the sustain transfer rate is 99, or (73+125)/2, then the 
bulk sector transfer time would be 512/(99*1024*1024) = 4.932 * 10-6 s.

Does anyone have some idea for the problem?

Thanks,
Weafon


>
> ----------------------
> *Maliha* rimuni at gmail.com 
> <mailto:disksim-users%40ece.cmu.edu?Subject=Re%3A%20%5BDisksim-users%5D%20Negative%20transfer%20time%20in%20Seagate%20Cheetah%2015k.5%0A%09disk%20spec&In-Reply-To=%3C949d418b0903171316y3e7dec94yeb88e84dd729a2dd%40mail.gmail.com%3E> 
>
> /Tue Mar 17 16:16:02 EDT 2009/
>
> Hi
>
> I have downloaded the specification of Seagate Cheetah 15k.5 disk from 
> the
> "on-line database of disk parameters" provided by the disksim team. The
> disksim_disk block in file Seagate-Cheetah15k5.diskspecs specifies the 
> disk
> transfer time as follows:
> Bulk sector transfer time = -0.015000
>
> Does anyone have any idea why the transfer time is negative? (The Bus and
> Controller transfer times are specified as zero).
>
> Thanks in advance,
> Maliha
>
>
>