IBM C2B 2.25 Brick On Sled carrier 128-pin HPC, SSA manual Specifications, General

U S E R RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS

O E M F U N C T I O N A L S P E C I F I C A T I O N U L T R A S T A R X P ( D F H C ) SSA M O D E L S 1.12/2.25 G B - 1.0" H I G H

2.0 Specifications

All specifications are nominal values unless otherwise noted.

The Ultrastar XP SSA data storage capacities vary as a function of model and user block size. The emerging Industry trend is capacity points in 1.08GB (i.e. 1.08/2.16/4.32) at a block size of 512 bytes. This and future products will always plan to provide capacities that are consistent with this trend. Users that choose to make full use of the Ultrastar XP SSA drive capacity above the standard capacity points may not find equivalent capacity breakpoints in future products.

2.1 General

Note: The recording band located nearest the disk outer diameter (OD) is referred to as 'Notch #1'. While the recording band located nearest the inner diameter (ID) is called 'Notch #10'. 'Average'values are weighted with respect to the number of LBAs per notch when the drive is formatted with 512 byte blocks.

Data transfer rates

Notch #1 Notch #10 Average

Buffer to/from media

Host to/from buffer

Data Buffer Size (bytes)

Rotational speed (RPM)

Average latency (milliseconds)

Track Density (TPI)

12.58 9.59 12.07 MB/s (instantaneous)

up to 20.0 MB/s (synchronous) (sustained)

512 K (See 3.0, “Performance” onpage 39 for user data capacity.)

7202.7

4.17

4352

Minimum Maximum

Recording density (BPI)	96,567	124,970
Areal density (Megabits/square inch)
	420.3	543.9
(model numbers - > )
	C4x	C2x	C1x
Disks
	8	4	2
User Data Heads (trk/cyl)
	16	8	4
Seek times (in milliseconds)
Single cylinder (Read)
	0.5	0.5	0.5
(Write)
	2.0	2.0	2.0
Average (weighted) (Read)
	8.0	7.5	6.9
(Write)
	9.5	9.0	8.5
Full stroke (Read)
	16.5	15.0	14.0
(Write)
	18.0	16.5	15.5

Note: Times are typical for a drive population under nominal voltages and casting temperature of 25˚ C. Weighted seeks are seeks to the cylin- ders of random logical block addresses (LBAs).

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