[Debian-eeepc-devel] max solidstate disk speed?

[Jelle de Jong]

Karl O. Pinc wrote:
> 
> On 03/20/2008 05:04:52 PM, Jelle de Jong wrote:
>> Hello all,
>>
>> I was reading trough my debian sid boot dmesg and saw the following
>> lines:
>>
>> ata2.00: ATA-4: SILICONMOTION SM223AC, , max UDMA/66
>> ata2.00: 7815024 sectors, multi 0: LBA
>> ata2.00: limited to UDMA/33 due to 40-wire cable
>> ata2.00: configured for UDMA/33
>>
>> I think the ssd is not running on his max speed, is this true, and
>> what
>> can we do about it?
> 
> Wikipedia 
> (http://en.wikipedia.org/wiki/Advanced_Technology_Attachment#Differences_between_connectors_on_80_conductor_cables) 
> 
> sez:
>  "Since the old 40 conductor cables do not ground pin 34, the presence 
> of a ground connection indicates that an 80 conductor cable is installed."
> 
> So, it's either the cable, the ssd or the mobo that needs fiddling
> with, unless you think it's safe to violate the ATA requirements
> and want to try flipping some bit in the software.  (Probably
> a kernel command line option.)  (Again, wikipedia:
> [80 pin cables are] "necessary to enable the 66 megabytes
> per second (MB/s) transfer rate of UDMA4 to work reliably.")
> 

Hi Karl,

The ssd in the eeepc is connected with pci-e, maybe theres a databus 
inside the ssd, but nothing that is controllable by users. Thats why i 
think its a software of bad design issue.

Kind regards,

Jelle