User manual MAXTOR ST32430N VOLUME 1

[. . . ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAWK 2LP Family: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST32430N/ND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST31230N/ND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Manual, Volume 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HAWK 2LP Family: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST32430N/ND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST31230N/ND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Manual, Volume 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . © 1996 Seagate Technology, Inc. [. . . ] The +5 and +12 volt supplies shall employ separate ground returns. Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device. 7. 2. 1 Conducted noise immunity Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 mHz. Maximum allowed noise values given below are peak to peak measurements and apply at the drive power connector. +5 V = +12 V = 150 mV pp from 0 to 50 kHz and 45 mA pp from 50 kHz to 10 mHz. 150 mV pp from 0 to 50 kHz and 60 mA pp from 50 kHz to 10 mHz. Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F 19 _____________________________________________________________________________________ 7. 2. 2 Power sequencing The drive does not require power sequencing. The drive protects against inadvertent writing during power up and down. Daisy-chain operation requires that power be maintained on the terminated drive to ensure proper termination of the peripheral I/O cables. 7. 2. 3 12 V - current profile Figure 7. 2. 2-1 identifies the drive +5 V and +12 V current profile. The current during the various times is as shown: T -Power is applied to the drive. T1 -Controller self tests are performed. T2 -Spindle begins to accelerate under current limiting after performing drive internal diagnostics. T3 -The spindle is up to speed and the Head-Arm restraint is unlocked. T4 -The heads move from the landing zone to the data area. T5 -The adaptive calibration sequence is performed. T6 -Calibration is complete and the drive is ready for reading and writing. See Table 7. 2-1 for maximum current requirements. 2. 5 T3 T1 2. 0 T2 T4 T5 T6 1. 5 12V Current (amps) 1. 0 0. 5 0 0. 8 2 4 6 8 10 Seconds 12 14 16 18 20 0. 6 5V Current (amps) 0. 4 0. 2 0 2 4 6 8 10 Seconds 12 14 16 18 20 Figure 7. 2. 2-1. Typical Hawk 2LP family drive +5 V and +12 V current profile 20 Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F _____________________________________________________________________________________ 7. 3 Heat/power dissipation For drives with single ended interface circuits, typical operating random read power dissipation is 9. 0 watts (30. 8 BTUs per hour) of DC power average at nominal voltages. Typical power dissipation under idle conditions is 6. 0 watts (20. 5 BTUs per hour). [. . . ] The Installation Guide provides basic information on the care and handling of Winchester disc peripherals in general. Some information needed when installing the drive is included to assist individuals not familiar with the product. It also includes basic information to assist in obtaining service for the drive. 56 Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. F _____________________________________________________________________________________ 13. 0 Accessories All accessories are designed for implementation by the customer. [. . . ]