Dear All
I want to ask whether using PC with SSD drive hard disk will make the time of the dynamic analysis iteration faster, i am asking because one of the my dynamic analysis included 322 eigenvalues with desired time step of 10 ms over total time interval of 4000 ms .which took almost 3 hours to start seeing the outputs (I am using PC with 2.8 GHz Intel® Core™2 Duo Processor and 2 GB rams with with normal HDD).

I doubt you will see a big difference. The computations and combinations are all done in memory. Only when the data is written to the files is the hard disc used.

Time the various drives performing a simple copy (in Windows Explorer) with various file sizes (10Mb, 50Mb, etc) and see what sort of difference you notice.

In time history analysis, the magnitude of the applided load is determined by the product of the profile force, the force sets magnitude and the scale in the shock case.

The following are the cases we considere and i request you to suggest which one we shall follow,

Case-1, Profile force - 80 KN, Force Set magnitude 80 KN and the scale factor is 1, so the magnitude is (80*80*1).

Case-2, Profile force - 80 KN, Force Set magnitude 1 and the scale factor is 1, so the magnitude is (80*1*1).

Please clarify it.

Sillyman,

1) You want option #2.

2) You really should have started a new topic for this question. The time history loading has nothing to do with the hard drive speed issue.

Get a faster processor, something in the 3 GHz plus category but not one of the Intel "Extreme" editions. More (and faster) RAM may also help. As for the SSD, they are generally faster in read operations but from my research repeated write operations gradually degrade the performace of the drive to the point where parts of it will no longer store data. They include "extra" space and distribute the write operation over the entire drive to handle such occurences but I wouldn't use an SSD as a "scratch" drive - use it for the OS and program data which gets read frequently instead.

Since this topic is quite old, I'd like to resume it.
We are performic time-hystory analysis on very big system.
Every run takes hours, and we are using new and expensive computers.
Does somebody have experience in using ssd? Did you find big differences?