I have one HP ML370 G5 server. Which has four 146GB SAS disks and two 300GB SAS disks that are configured as RAID 0.
I have encountered a problem with one of my disks. The windows server event viewer shows the error below:


  Logical drive 2 configured on array controller P400 located in server
  slot 1 returned a fatal error during a read/write request from/to the
  volume. Logical block address 6331648, block count 256 and command 32
  were taken from the failed logical I/O request. Array controller P400
  located in server slot 1 is also reporting that the last physical
  drive to report a fatal error condition (associated with this logical
  request), is located on bus 0 and ID 1.


How can I determine whether all of my disks work well or not? and check for bad blocks on my disks!


Question: Estimating RPM to RCF in Methods from Older Papers
Answer: I am not sure about what they used in 1958 (perhaps Sorvall). However you may look at recent papers for ECM protein isolation (if that was your objective).

Have a look at this article. 

From materials and methods:


  ECM protein isolation.
  
  Fibroblasts or A431 cells were removed from the
  surface of the culture plate with 2 mM EDTA in PBS for 3–5 min at
  37⁰C. Detached cells were discarded, and remaining ECM proteins
  attached to the surface of culture plates were washed with the same
  solution. Cell removal was controlled under the microscope. After
  cells were completely removed, matrix proteins were covered with 5%
  acetic acid and incubated at 4⁰C overnight. Then, acetic acid was
  removed and exchanged with a buffer containing 125 mM Tris-HCl, pH
  6.8, 0.1% SDS, 10% glycerol, 1% DDT, 0.05 mM PMSF, protease inhibitor cocktail (Roche, Germany), and incubated at 37⁰C for 1 h. Proteins
  were removed with a scraper. The procedure was repeated three times.
  All protein extracts, including acetic acid, were combined and ECM
  proteins were precipitated by five volumes of acetone. After
  incubation at –20⁰C overnight and centrifugation at 7000 g for 15 min,
  the protein pellets were dissolved in an appropriate buffer for
  further analysis by one- or two-dimensional gel electrophoresis.
  
  In addition, we obtained a Triton X-100-soluble fraction of ECM
  proteins. Cells were removed as described above; dishes were filled
  with 1% Triton X-100 and incubated at 37⁰C for 30 min. The extraction
  was repeated three times. The following procedure of ECM extraction
  was the same as described above. Samples obtained from both fractions
  were dissolved in a buffer for one-dimensional (Laemmli) or
  two-dimensional (rehydration buffer containing 8 M urea, 2% CHAPS, 20
  mM DDT, 0.1% Triton X-100) electrophoresis. Proteins that remained
  after Triton X-100 extraction were dissolved in Laemmli sample buffer.