Re: read vs write

[Saswat Praharaj <saswat@gmail.com>]

yups I meant MBps ..thanks for correcting me .

However, I dont agree with your ford/road example.

I just checked the product specification of STA340016A (seagate) . 

Here is what they claim : 

[  This manual describes the functional, mechanical and interface specifi-
cations for the ST380021A, ST360021A, ST340016A and ST320011A.
These drives provide the following key features:
· 7,200-RPM spindle speed and 2-Mbyte buffer combine for superior
  desktop performance
· High instantaneous (burst) data-transfer rates (up to 100 Mbytes per
  second) using Ultra DMA mode 5 ]

I have found average seek time is little faster (around 1ms) for read
than write.
Still that doesn't justify the write speed of 15-20 MBps and 55-60
MBps for read.

Can anyone help me understading how/why write is different than read.

Thanks and Regards,
Saswat

On 7/25/05, Stefan Smietanowski <stesmi@stesmi.com> wrote:
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> Hi Saswat.
> 
> > Moreover, I am wondering if I could achieve the 100Mbps read speed as
> > claimed by different vendors.For me , It should ideally be 100 Mbps as
> > I am using a 80 conductor cable and UDMA 5.Why then I am getting 58
> > Mbps max . .
> 
> If you mean Mbps then you are already above it. 100Mbps = 12.5MB/s
> give or take and both speeds are above that.
> I guess you probably mean 100MB/s though and that is only what
> the cable can take.
> 
> If you take a T-ford onto the highway - can you go 130Km/h in it?
> 
> No, the road is rated at 130Km/s but the car can't go that fast.
> 
> Same here, the standard says you can transfer 100MB/s over the cable
> but the disk isn't fast enough to be able to transfer that fast.
> 
> // Stefan
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