User manual MAXTOR SAVVIO 15K.2 SAS

[. . . ] Product Manual Savvio 15K. 2 SAS ® Standard Models Self-Encrypting Drive Models ST9146852SS ST973452SS ST9146752SS ST973352SS SED FIPS 140-2 Models ST9146652SS ST973252SS 100516230 Rev. E March 2011 © 2011, Seagate Technology LLC All rights reserved. E March 2011 Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology LLC in the United States and/or other countries. Savvio and SeaTools are either trademarks or registered trademarks of Seagate Technology LLC or one of its affiliated companies in the United States and/or other countries. [. . . ] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to maximum track. Savvio 15K. 2 SAS Product Manual, Rev. E 23 General DC power requirement notes. Minimum current loading for each supply voltage is not less than 1. 7% of the maximum operating current shown. The +5V and +12V supplies should 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. Parameters, other than spindle start, are measured after a 10-minute warm up. 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. +5V +12V = = 250 mV pp from 100 Hz to 20 MHz. 250 mV pp from 20 KHz to 5 MHz. 7. 2. 2 Power sequencing The drive does not require power sequencing. The drive protects against inadvertent writing during power-up and down. 24 Savvio 15K. 2 SAS Product Manual, Rev. E 7. 2. 3 Current profiles The +12V and +5V current profiles for the Savvio 15K. 2 SAS drives are shown below. Figure 1. Current profile for 146GB models. Savvio 15K. 2 SAS Product Manual, Rev. E 25 Figure 2. Current profile for 73GB models Note: All times and currents are typical. See Tables 2 and 3 for maximum current requirements. 26 Savvio 15K. 2 SAS Product Manual, Rev. E 7. 3 Power dissipation 146GB models in 6. 0 Gbit operation Typical power dissipation under idle conditions in 6. 0 Gb operation is 4. 37 watts (14. 91 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 3). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3. 4123. Figure 3. 146GB models (6. 0 Gbit) DC current and power vs. input/output operations per second 146GB models in 3. 0 Gbit operation Typical power dissipation under idle conditions in 3. 0 Gbit operation is 4. 32 watts (14. 74 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 3). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. [. . . ] See Table 13 for signal type and signal name information. 12. 5. 1 Ready LED Out The Ready LED Out signal is driven by the drive as indicated in Table 14. Table 14: Ready LED Out conditions LED status 0 Off On On Off 1 Off On Off On Normal command activity Ready LED Meaning bit mode page 19h Spun down and no activity Spun down and activity (command executing) Spun up and no activity Spun up and activity (command executing) Spinning up or down Format in progress, each cylinder change Blinks steadily (50% on and 50% off, 0. 5 seconds on and off for 0. 5 seconds) Toggles on/off The Ready LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper +3. 3 volt supply through an appropriate current limiting resistor. [. . . ]