Strategy  for  replacing  a  hard  disk  drive 
Always  try  to  run  a  low-level  format  before  replacing  a  hard 
disk  drive. 
 
Attention:  The  drive  startup  sequence  in  the  computer 
you  are  servicing  may  have  been  changed.  Be  extremely 
careful  during  write  operations  such  as  copying,  saving,  or 
formatting.  If  you  select  an  incorrect  drive,  data  or 
programs  can  be  overwritten. 
How  to  use  error  messages 
Use  the  error  codes  displayed  on  the  screen  to  diagnose 
failures.  If  more  than  one  error  code  is  displayed,  begin  the 
diagnosis  with  the  first  error  code.  Whatever  causes  the 
first  error  code  may  also  cause  false  error  codes.  If  no 
error  code  is  displayed,  see  whether  the  error  symptom  is 
listed  in  the  Symptom-to-FRU  Index  for  the  computer  you 
are  servicing. 
 
 
Diskette  compatibility  matrix 
The  compatibility  of  each  of  the  drives  with  the  diskettes 
for  it  is  as  follows: 
 
Diskette
drive
 
Diskette
capacity
 
Compatibility 
3.5-inch  1.0  MB  Read  and  write 
2.0  MB  Read  and  write 
4.0  MB  Not  compatible
 
 
 
Safety  notices:  multilingual  translations 
In  this  manual,  safety  notices  appear  in  English  with  a 
page  number  reference  to  the  appropriate  multilingual, 
translated  safety  notice  found  in  this  section. 
The  following  safety  notices  are  provided  in  English, 
French,  German,  Hebrew,  Italian,  and  Spanish. 
Important  service  information  
4  R50/R50p,  R51  Series