4XB0K12354 - Lenovo HDD_BO 3.5 240GB PM863A SATANHS SSD

Enterprise Entry SSDs and Enterprise SSDs have similar read and write IOPS performance, but the key difference between them is their endurance (or lifetime) (that is, how long they can perform write operations because SSDs have a finite number of program/erase (P/E) cycles). Enterprise Entry SSDs have a better cost/IOPS ratio but lower endurance compared to Enterprise SSDs. SSD write endurance is typically measured by the number of program/erase (P/E) cycles that the drive incurs over its lifetime, listed as the total bytes of written data (TBW) in the device specification.

The TBW value assigned to a solid-state device is the total bytes of written data (based on the number of P/E cycles) that a drive can be guaranteed to complete (% of remaining P/E cycles = % of remaining TBW). Reaching this limit does not cause the drive to immediately fail. It simply denotes the maximum number of writes that can be guaranteed. A solid-state device will not fail upon reaching the specified TBW. At some point based on manufacturing variance margin, after surpassing the TBW value, the drive will reach the end-of-life point, at which the drive will go into a read-only mode.

Because of such behavior by Enterprise Entry solid-state drives, careful planning must be done to use them only in read-intensive or mixed up to 70% read/30% write environments to ensure that the TBW of the drive will not be exceeded before the required life expectancy.

For example, the 480 GB PM863a drive has an endurance of 683 TB of total bytes written (TBW). This means that for full operation over five years, write workload must be limited to no more than 374 GB of writes per day, which is equivalent to 0.8 full drive writes per day (DWPD). For the device to last three years, the drive write workload must be limited to no more than 624 GB of writes per day, which is equivalent to 1.3 full drive writes per day.

 

Specification:

 

Hard drive
SSD capacity	240 GB
Data transmission
Read speed	330 MB/s
Write speed	300 MB/s
Random write (4KB)	9000 IOPS
Random read (4KB)	86000 IOPS
Write latency	30 µs
Read latency	130 µs
Data transfer rate	6 Gbit/s
Endurance
Mean time between failures (MTBF)	2000000 h
Performance
Interface	Serial ATA III
Component for	Server/workstation
Hot-swap	Yes
SSD capacity	240 GB
Read speed	330 MB/s
Write speed	300 MB/s
Random write (4KB)	9000 IOPS
Random read (4KB)	86000 IOPS
Mean time between failures (MTBF)	2000000 h
Write latency	30 µs
Read latency	130 µs
Data transfer rate	6 Gbit/s
Design
Component for	Server/workstation
Product colour	Black
SSD form factor	2.5"
Features
Interface	Serial ATA III
Component for	Server/workstation
Hot-swap	Yes
SSD capacity	240 GB
Read speed	330 MB/s
Write speed	300 MB/s
Random write (4KB)	9000 IOPS
Random read (4KB)	86000 IOPS
Mean time between failures (MTBF)	2000000 h
Write latency	30 µs
Read latency	130 µs
Data transfer rate	6 Gbit/s
SSD form factor	2.5"
Harmonized System (HS) code	84717070
Power
Power consumption (write)	3 W
Power consumption (read)	3 W
Operational conditions
Operating temperature (T-T)	0 - 70 °C
Operating relative humidity (H-H)	8 - 85%
Operating shock	1500 G
Operating vibration	2.17 G
Maximum operating altitude	120078.7" (3050 m)
Technical details
Interface	Serial ATA III
Hot-swap	Yes
Operating temperature (T-T)	0 - 70 °C
Operating relative humidity (H-H)	8 - 85%
Operating shock	1500 G
Operating vibration	2.17 G
Maximum operating altitude	120078.7" (3050 m)
Product colour	Black
SSD form factor	2.5"
Weight & dimensions
Width	2.76" (70 mm)
Weight	2.12 oz (60 g)
Height	0.276" (7 mm)
Depth	3.94" (100 mm)
Other features
Product colour	Black