Seagate ST225 - Page 5

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Appendix 1:32 Sector, 256 Byte/Sector Format Example
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I:'WTRODUcriON •.••••••••.••••••••••••••••••••••••.••••••.•••••
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i.OSi'ECiHCATiOS SUMMARY •••••••••••••••••••••••••••••••••.• 8
1.1 Perrormance Specificalions ........•.•.••••..••.•.•...•...•••....• i
1.1.1 Access Time Ddinition and Timins .•.••..•.•..•.•..•...•..••.. I
1.2 Funclional Specifica.ions .••.•.•••.••.••••.•.•..•..••.•.•.•.••••. I
1.3 Physical Specificalions ...•..........•.••••.•..•..••..•....•••... !
1.4 RtiiabililY Specificalions ..........•...••••..•.•.•.•..•••..•.•••.. 2
1.4.1 Read Error Rales ....•.......•.•..•••••.•••.•....••..•.•..... 2
1.4.1.1 Bil Jiner •....•.....•......••..••....•.•.•...•..•......•. 2
1.4.2 Media DereCIS ••••........••.•.••••.•..•.......••••..•••.... 2
I.S Environmental Specifications ...........•••...........••.••.•.••.. 2
1.5.1 Ambien. Temperalure ..........•..••.•...•..••.••••..••....•. 2
1.5.2 TemperaiUre Gradi.ni. ......•...•...••..••..•..........•.••.• 2
1.5.3 Relalive HumidilY ......•..•.••......••.•.•.•.•..........•••• 3
I.SA Ahilude Limi.s .........••......•••.••..••......•...••.•.••• 3
I.S.S Optrating Shock ....•....••.....••••..••......•.••••••.•.... 3
1.5.6 Operaling Vibralion ........•.....•...•.••......••...•..•..•• 3
1.5.7 Nonope,ating Shock ..•...•.•......•......•.......•..•..•.•.. 3
!.S.8 Nonoperaling Vibralion ...........••.......••....••••••••.•.. 3
1.6 DC Power Requiremenls ...•.....•..•..••..•.•..•..•....•••...•.• 3
1.6.1 Inpu. Noise Ripple •....•..•.•....•.....•.•••.•.....•.••..•.. 4
1.6.2 Inpu. Noise Frequency •..•..•....•••••...•.......•.•..•.••••• 4
1.6.3 H.al Dissipation ••...•••..•.•..••.•.••.•••..•...••.••.•...•. 4
1.7 Mounling Requirements ...•.....••.••.•.•.••••.•.•.•••...••••... 5
1.7.1 Shock Mounring Recommendalion .•••....••...•.•....••.•••... 5
1.7.2 Handling and Slatic·Discharge Precautions .••.••......••.•.•••.• 6
1.7.3 Shipping Zone .•.....•......•..••.••...••••.....••..•.•..•.• 6
USn25 HOST/DRiVE INTERFACE ••••••••••••••••••••••••••••••• 7
2.1 Conlrol/Slatus Signals: PCB Edge·Connector. JI .•..•...•••••.•....• 7
2.2 Dala Signals; PCB Edge·Conneclor, J2 ...•••..•...••.•...••••..••.• 9
2.3 DC Power Connector, J3 .•••.....•..••.•..•.•.•...•.....••....•.. II
3.0 DRIVE CONfiGURATION ••••••••••••••••••••.•• , ••••••••••••• 13
3.1 Drive Configuralion Shunt. J7 ..••••.•••••.••••••...•.•.••....••.. 13
3.2 Drive Seleci Configuralion .•••.......•.•••••..•..•.•.•.•.••..••.. 13
3.2.1 Daisy.Chain •...•••.•...••.•..•.•.•...••...•.•...••.•••..... 13
3.3 Radial ..•...•...••....•.•..•.•..•.•...•••••.••.•.•••.••.•..•.. 14
3.4 Write Fault ....••.•••...•.•.•...•.•.••••.•..•••..•...•••...•••• 14
3.5 lire Test. ...•.•••...•....•••..•.....••••...••..•••.••••.•.••••. 14
3.6 Recovery Mode ••.•.•........•....••..•..•..•..•...••••.•.••.... IS
4.0 CONTROL INi'UYSiGNALS ••••••••••••••••••••••••••••••••••• 16
4.1 Head Seleci 2", 2'. 2'. 2' ..•...•.....•....••.••••.....••..•...••..• i6
4.2 Wrile Gale •.......•....•......•.••..••..•.•......•.•••••..•... 16
4.3 Slep ....•.....••...•....•••.•..•••••••.•.••.•....•....•••••••• 17
4.3.1 Burrered Seek ..•..•.•.•.•..•..•..••••.••••.•.•.•.•••••.••••. 18
4.3.2 Slow·Slep (Track-Io-Tr:ack) .••..••••.••••.••••.••.••..••.•••.•. 18
4.3.3 AUlo·Truncation •.. , •....•...•.•..••.•.••••..•.•.••.••.•.••• 19
4.4 Direclion In •....••.•• , •.••..•..•..•••••..••.••..•.••.••.•..... 19
4.5 Drive Select. ......•.•••....••......•••.•.•....•....•..•..•.•••. 20
4.6 Recovery Mode ...••••......•......••••.•.••••..•.•..•.••.•..... 21
5.0 CONTROL OUTPUT SiGNALS ••••••••••••••••••••••••••••••••• 22
5.1 Drive Selected ....•..•••...••.....•...••.....••••.•....••••••.•. 22
5.2 Index ..•..•.•...•••••.•....•....••..•.•••.••..••..•.•••.••..•. 22
5.3 Track" .....•..•.......•.•......•••••••••.•....•.••.•.•••••..• 22
5.4 index and Track" Scnsinl ..•..•...••.••••.•.............•..•••.• 22
5.5 Ready .•..•.•...••.•.•..•••.••..••..••...•.•....•••....••.•... 23
5.6 Seck Complete ...••.•..•....•.....•..•••.•.••.•.•...••.••.•.••• 23
5.7 Writc f~uli ....•................•..•••••..••••........••.••••.. 23
S.7.1 Wriie fault Signll <lener.iion ......••••.••••...••...•..•..••.• 23
5.7.1.1 Wrile Curreni imerrupiioli .......•....•...•..........••.•. 23
TABLE OF CONTENTS
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