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250 GB
250 GB250 GB
250 GB
(7,200 rpm)
Capacity
CapacityCapacity
Capacity
250,059,350,016 bytes
Height
HeightHeight
Height
1 inches; 2.54 cm
Width
WidthWidth
Width
Media diameter: 3.5 inches; 8.89 cm
Physical size: 4 inches; 10.2 cm
Interface
InterfaceInterface
Interface
Serial ATA (3.0 Gb/s)
Native Command Queuing enabled (Model EA788AA only)
Synchronous Transfer
Synchronous TransferSynchronous Transfer
Synchronous Transfer
Rate
RateRate
Rate
(Maximum)
Up to 3.0 Gb/s
Cache
CacheCache
Cache
With NCQ (Model EA788AA):16 MB
Without NCQ (Model PY278AA): 8MB
Seek Time
Seek TimeSeek Time
Seek Time
(typical reads,
includes controller
overhead, including
settling)
Single Track
Single TrackSingle Track
Single Track
1.0 ms
Average
AverageAverage
Average
18.5 ms
Full-Stroke
Full-StrokeFull-Stroke
Full-Stroke
18 ms
Rotational Speed
Rotational SpeedRotational Speed
Rotational Speed
7,200 rpm
Logical Blocks
Logical BlocksLogical Blocks
Logical Blocks
488,397,168
Operating Temperature
Operating TemperatureOperating Temperature
Operating Temperature
41° to 131°F (5° to 55°C)
160 GB
160 GB160 GB
160 GB
(7,200 rpm)
Capacity
CapacityCapacity
Capacity
160,041,885,696 bytes
Height
HeightHeight
Height
1 inches; 2.54 cm
Width
WidthWidth
Width
Media diameter: 3.5 inches; 8.89 cm
Physical size: 4 inches; 10.2 cm
Interface
InterfaceInterface
Interface
Serial ATA (3.0 Gb/s)
Synchronous Transfer
Synchronous TransferSynchronous Transfer
Synchronous Transfer
Rate
RateRate
Rate
(Maximum)
Serial ATA (3.0 Gb/s), Native Command Queuing enabled
Cache
CacheCache
Cache
8 MB
Seek Time
Seek TimeSeek Time
Seek Time
(typical reads,
includes controller
overhead, including
settling)
Single Track
Single TrackSingle Track
Single Track
0.9 ms
Average
AverageAverage
Average
9.3 ms
Full-Stroke
Full-StrokeFull-Stroke
Full-Stroke
18 ms
Rotational Speed
Rotational SpeedRotational Speed
Rotational Speed
7,200 rpm
Logical Blocks
Logical BlocksLogical Blocks
Logical Blocks
312,581,808
Operating Temperature
Operating TemperatureOperating Temperature
Operating Temperature
41° to 131°F (5° to 55°C)
QuickSpecs
HP xw8400 Workstation
HP xw8400 WorkstationHP xw8400 Workstation
HP xw8400 Workstation
Technical Specifications - Hard Drives
DA - 12522 Canada — Version 26 — February 22, 2008
Page 41