IBM IC35L040AVVN07-0 - 40GB IDE Deskstar 120GXP 7200RPM UATA-100..., Specifications, Page: 64 / 211

6.6 Reliability
6.6.1 Data integrity
No more than one sector is lost at Power loss condition during the write operation when the write cache
option is disabled. If the write cache option is active, the data in write cache will be lost. To prevent the
loss of customer data, it is recommended that the last write access before power off be issued after setting
the write cache off.
6.6.2 Cable noise interference
To avoid any degradation of performance throughput or error rate when the interface cable is routed on
top or comes in contact with the HDA assembly, the drive must be grounded electrically to the system
frame by four screws. The common mode noise or voltage level difference between the system frame and
power cable ground or AT interface cable ground should be in the allowable level specified in the power
requirement section.
6.6.3 Start/stop cycles
The drive withstands a minimum of 40,000 start/stop cycles in a 40° C environment and a minimum of
10,000 start/stop cycles in extreme temperature or humidity within the operating range. See Figure 51 on
page 45 and Figure 52 on page
46 .
6.6.4 Preventive maintenance
None
6.6.5 Data reliability
Probability of not recovering data is 1 in 10
13
bits read
ECC On The Fly correction
!
1 Symbol : 8 bits
!
4 Interleave
!
20 ECCs are embedded into each interleave
!
This implementation always recovers 5 random burst errors and a 153-bit continuous burst error
6.6.6 Required Power-Off Sequence
The required BIOS sequence for removing power from the drive is as follows:
Step 1: Issue one of the following commands.
Standby
Standby immediate
Sleep
Note: Do not use the Flush Cache command for the power off sequence because this command does
not invoke Unload
Step 2: Wait until the Command Complete status is returned. In a typical case 350 ms are required
for the command to finish completion; however, the BIOS time out value needs to be 30 seconds
considering error recovery time. Refer to section 12.0 "Timings," on page 193.
Step 3: Terminate power to HDD.
Deskstar 120GXP hard disk drive specifications
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