................................................. Cheetah 73FC Disc Drive ................................................. ST173404FC/FCV ................................................. ................................................. ................................................. Product Manual, Volume 1 .................................................
................................................. Cheetah 73FC Disc Drive ................................................. ST173404FC/FCV ................................................. ................................................. ................................................. Product Manual, Volume 1 .................................................
© 2000 Seagate Technology, LLC All rights reserved August 2000 Publication number: 83329482, Rev. C Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology, LLC. Cheetah, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either trademarks or registered trademarks of Seagate Technology, LLC, or one of its subsidiaries. All other trademarks or registered trademarks are the property of their respective owners.
Revision status summary sheet Revision Date A 7/27/2000 B (Class A Release) 8/24/2000 C 8/29/2000 Writer/Engineer Sheets Affected L. Newman/G. Velaski L. Newman/G. Velaski L. Newman/G. Velaski 1/1, v thru viii, 1 thru 68. Page 10. Pages 6, 9, 10, 38, 39, 40, 43, 45, 46, 49, 52, 57, and 58.
Cheetah 73FC Product Manual, Rev. C vii Contents 1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.0 Applicable standards and reference documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1.
viii Cheetah 73FC Product Manual, Rev. C 6.5 6.4.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cheetah 73FC Product Manual, Rev. C ix List of Figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Cheetah 73FC family disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Cheetah 73FC disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cheetah 73FC Product Manual, Rev. C 1.0 1 Scope This manual describes Seagate® Cheetah 73FC (Fibre Channel) disc drives. Cheetah 73FC drives support the Fibre Channel Arbitrated Loop and SCSI Fibre Channel Protocol specifications to the extent described in this manual. The Fibre Channel Interface Manual (part number 77767496) describes the general Fibre Channel Arbitrated Loop characteristics of this and other Seagate Fibre Channel drives. Figure 1.
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Cheetah 73FC Product Manual, Rev. C 2.0 3 Applicable standards and reference documentation The drive has been developed as a system peripheral to the highest standards of design and construction. The drive depends upon its host equipment to provide adequate power and environment in order to achieve optimum performance and compliance with applicable industry and governmental regulations.
4 Cheetah 73FC Product Manual, Rev. C Australian C-Tick If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995 and meets the Electromagnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Management Agency (SMA). 2.
Cheetah 73FC Product Manual, Rev. C 3.0 5 General description TM Cheetah 73FC drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood (PRML) read channel electronics, embedded servo technology, and a Fibre Channel interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers.
6 Cheetah 73FC Product Manual, Rev. C 3.
Cheetah 73FC Product Manual, Rev. C 3.4 • • • • • 7 Reliability 1,200,000 hour MTBF LSI circuitry Balanced low mass rotary voice coil actuator Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.) Dithering 3.5 Unformatted and formatted capacities Formatted capacity depends on the spare reallocation sectors scheme selected, the number of dta tracks per sparing zone, and the number of alternate sectors (LBAs) per sparing zone.
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Cheetah 73FC Product Manual, Rev. C 4.0 9 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Cheetah 73FC drives. 4.1 Internal drive characteristics Drive capacity Read/write data heads Bytes per track Bytes per surface Tracks per surface Tracks per inch Peak bits per inch Internal data rate Disc rotation speed Avg rotational latency ST173404FC 73.4 ..........................
10 4.2.3 Cheetah 73FC Product Manual, Rev. C General performance characteristics Minimum sector interleave 1 to 1 Data buffer to/from disc media (one 512-byte logical block)* Minimum Average Maximum 26.7 MBytes/sec 33.0 MBytes/sec 40.
Cheetah 73FC Product Manual, Rev. C 4.5 Note. 11 Cache operation Refer to the Fibre Channel Interface Manual for more detail concerning the cache bits. Of the 4,096 kbytes physical buffer space in the drive, 3,600 kbytes (14,399 kbytes of the 16,384 kbytes on FCV units) can be used as a cache. The buffer can be divided into logical segments (using Mode Select Page 08h, byte 13) from which data is read and to which data is written.
12 Cheetah 73FC Product Manual, Rev. C to be written are already stored in the cache from a previous read or write command. If there are, the respective cache segments are cleared. The new data is cached for subsequent Read commands.
Cheetah 73FC Product Manual, Rev. C 5.0 13 Reliability specifications The following reliability specifications assume correct host and drive operational interface, including all interface timings, power supply voltages, and environmental requirements. Seek error rate: Read Error Rates1 Recovered Data Unrecovered media data: Miscorrected media data: Interface error rate: MTBF: Service life: Preventive maintenance: 1.
14 5.1.4 Cheetah 73FC Product Manual, Rev. C Seek errors A seek error is defined as a failure of the drive to position the heads to the addressed track. If the error recovery fails, a seek positioning error (15h) is reported with a Medium (03h) or Hardware Error (04h) reported in the sense key. This is an unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Refer to the Fibre Channel Interface Manual, part number 77767496, for Request Sense information. 5.
Cheetah 73FC Product Manual, Rev. C 15 Failure rate is calculated as follows: • No system-induced failures counted • Based on 1,200,000 MTBF and 720 POH per month • Month 1’s rate includes a 300 PPM installation failure 5.2.3 Preventive maintenance No routine scheduled preventive maintenance is required. 5.2.4 Service life The drive has a useful service life of five years. Depot repair or replacement of major parts is permitted during the lifetime. 5.2.
16 Note. Cheetah 73FC Product Manual, Rev. C The drive’s firmware monitors specific attributes for degradation over time but can’t predict instantaneous drive failures. Each monitored attribute has been selected to monitor a specific set of failure conditions in the operating performance of the drive and the thresholds are optimized to minimize “false” and “failed” predictions. Controlling S.M.A.R.T. The operating mode of S.M.A.R.T.
Cheetah 73FC Product Manual, Rev. C 17 dictive threshold, a predictive failure is signaled. This counter is referred to as the Failure History Counter. There is a separate Failure History Counter for each attribute. 5.2.9 Drive Self Test (DST) Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a failed unit. DST validates the functionality of the drive at a system level. There are two test coverage options implemented in DST: 1. Extended test 2.
18 5.2.9.2.3 Cheetah 73FC Product Manual, Rev. C Short and extended tests DST has two testing options: 1. short 2. extended These testing options are described in the following two subsections. Each test consists of three segments: an electrical test segment, a servo test segment, and a read/verify scan segment. Short test (Function Code: 001b) The purpose of the short test is to provide a time-limited test that tests as much of the drive as possible within 120 seconds.
Cheetah 73FC Product Manual, Rev. C 19 tion, refer to the standard terms and conditions of purchase for Seagate products on your purchase documentation. The remaining warranty for a particular drive can be determined by calling Seagate Customer Service at 1-800-468-3472. You can also determine remaining warranty using the Seagate web site (www.seagate.com). The drive serial number is required to determine remaining warranty information.
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Cheetah 73FC Product Manual, Rev. C 6.0 21 Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of the drive. 6.1 AC power requirements None. 6.2 DC power requirements The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive connector. Table 1: DC power requirements ST173404FC/FCV Notes (Amps) +5V +12V [2] Regulation [5] ±5% ±5% [2] Avg idle current DCX [1] [7] 0.
22 Cheetah 73FC Product Manual, Rev. C 6.2.1 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. 0 to 100 kHz 100 kHz to 10 MHz 6.2.2 +5V +12V (with spindle motor not running) 150mV 100mV 150mV 100mV Power sequencing The drive does not require power sequencing.
Cheetah 73FC Product Manual, Rev. C 23 +5 Volt Current during spindle start – Typical Amperes 1.5 Average value of waveform A 1.0 0.5 Envelope of waveform 0.0 T0 T2 T1 0 T3 4 8 T4 12 T5 16 Seconds Figure 4.
24 Cheetah 73FC Product Manual, Rev. C 6.3 Power dissipation Typical power dissipation under idle conditions is 17.05 watts (58.18 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 5). 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. 1.
Cheetah 73FC Product Manual, Rev. C 25 Table 2: PCBA and HDA temperatures Items in Figure 6 Maximum allowable case temperature ( °C) operating Maximum allowable case [3] temperatures (°C) to meet MTBF spec. HDA [2] 1 (Processor) 2 (A/D Demod) 3 (FC Interface) 4 (Voyager) 60 77 93 100 86 45 57 73 80 66 Notes. [1] [2] [3] Section 8.3.1 describes the air-flow patterns used when generating the 1,200,000 hours MTBF guidelines in column 2. Air flow was opposite that shown in Section 8.3.1.
26 Cheetah 73FC Product Manual, Rev. C 6.4.2 Relative humidity The values below assume that no condensation on the drive occurs. a. Operating 5% to 95% non-condensing relative humidity with a maximum gradient of 10% per hour. b. Non-operating 5% to 95% non-condensing relative humidity. 6.4.3 Effective altitude (sea level) a. Operating –1,000 to +10,000 feet (–305 to +3,048 meters) b. Non-operating –1,000 to +40,000 feet (–305 to +12,210 meters) 6.4.
Cheetah 73FC Product Manual, Rev. C 27 d. Packaged Disc drives shipped as loose load (not palletized) general freight will be packaged to withstand drops from heights as defined in the table below. For additional details refer to Seagate specifications 30190-001 (under 100 lbs/45 kg) or 30191-001 (over 100 lbs/45 Kg). Package size Packaged/product weight Drop height <600 cu in (<9,800 cu cm) 600-1800 cu in (9,800-19,700 cu cm) >1800 cu in (>19,700 cu cm) >600 cu in (>9,800 cu cm) Any 0-20 lb (0 to 9.
28 Cheetah 73FC Product Manual, Rev. C 6.4.4.2 Vibration a. Operating - normal The drive as installed for normal operation, shall comply with the complete specified performance while subjected to continuous vibration not exceeding 5-400 Hz @ 0.5 G Vibration may be applied in the X, Y, or Z axis. Translational random flat profile: 10 - 400 Hz 0.4 GRMS b.
Cheetah 73FC Product Manual, Rev. C 6.5 29 Mechanical specifications The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimensions of the front panel are shown in figure below. Refer to Figure 8 for detailed mounting configuration dimensions. See Section 8.5, “Drive mounting.” Height: Width: Depth: Weight: 1.6 in 4.000 in 5.75 in 2.0 pounds 40.64 mm 101.6 mm 146.05 mm 0.
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Cheetah 73FC Product Manual, Rev. C 7.0 31 Defect and error management The drive, as delivered, complies with this product manual. The read error rates and specified storage capacities are not dependent upon use of defect management routines by the host (initiator). Defect and error management in the SCSI protocol involves the drive internal defect/error management and FC-AL system error considerations (errors in communications between the initiator and the drive).
32 Cheetah 73FC Product Manual, Rev. C Table 3: Read and write retry count maximum recovery times Read retry count1 Maximum recovery time per LBA (cumulative, msec) Maximum recovery time per Write retry count1 LBA (cumulative, msec) 0 1 2 3 4 5 6 7 8 9 10 11 (default) 77.6 89.6 304.5 328.4 346.3 197.0 459.7 590.8 614.7 668.4 740.4 1,670.5 0 1 2 3 4 5 (default) [1] 35.8 53.7 59.7 113.6 227.1 268.9 These values are subject to change.
Cheetah 73FC Product Manual, Rev. C 8.0 33 Installation Cheetah 73FC disc drive installation is a plug-and-play process. There are no jumpers, switches, or terminators on the drive. Simply plug the drive into the host’s 40-pin Fibre Channel backpanel connector (FC-SCA)— no cables are required. See Section 9.5 for additional information about this connector. Use the FC-AL interface to select drive ID and all option configurations for devices on the loop.
34 Cheetah 73FC Product Manual, Rev. C Drive Front Pin 1 J6 Reserved Port A Bypass LED [1] Port B Bypass LED [1] Fault LED [1] Reserved Active LED [2] +5V Active LED [1] Ground [3] Figure 10. 8.2.1 [1] The drive has a 2.2K ohm resistor in series with this LED driver. Tie the minus side of an external high-efficiency LED (i.e., 2ma) to this pin. Connect the plus side of the LED to +5V. [2] An external current-limiting resistor is required when connecting an LED to this pin.
Cheetah 73FC Product Manual, Rev. C 35 created while providing air flow to the electronics and HDA. Also, the shortest possible path between the air inlet and exit should be chosen to minimize the travel length of air heated by the drive and other heat sources within the rack, cabinet, or drawer environment. If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 11.
36 8.6 Cheetah 73FC Product Manual, Rev. C Grounding Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the user. The equipment in which the drive is mounted is connected directly to the HDA and PCBA with no electrically isolating shock mounts.
Cheetah 73FC Product Manual, Rev. C 9.0 37 Interface requirements This section partially describes the interface requirements as implemented on ST173404FC drives. Additional information is provided in the Fibre Channel Interface Manual (part number 77767496). 9.1 FC-AL features This section lists the Fibre Channel-specific features supported by ST173404FC drives. 9.1.1 Fibre Channel link service frames Table 4 lists the link services supported by ST173404FC drives.
38 Cheetah 73FC Product Manual, Rev. C 9.1.4 Fibre Channel port login Table 7 identifies the required content of the N_Port Login (PLOGI) payload from an initiator.
Cheetah 73FC Product Manual, Rev. C 9.1.5 39 Fibre Channel port login accept Table 8 identifies the N_Port Login access payload values.
40 Cheetah 73FC Product Manual, Rev. C 9.1.8 Fibre Channel fabric login Table 11 lists the fabric login payload from the drive.
Cheetah 73FC Product Manual, Rev. C 9.1.9 41 Fibre Channel fabric accept login Table 11 lists the required content of the Fabric Login Accept (ACC) payload from the fabric.
42 Cheetah 73FC Product Manual, Rev. C 9.1.10 Fibre Channel Arbitrated Loop options Table 13 lists the FC-AL options supported by Cheetah 73FC drives. Table 13: FC-AL options supported Option Supported OPEN Half Duplex Accepted from another device. OPEN Full Duplex Sent to open another device. Accepted from another device. Private Loop Yes Public Loop Yes Old Port State No Loop Position Yes Loop Position Report Yes 9.
Cheetah 73FC Product Manual, Rev. C 9.3 SCSI commands supported Table 14 lists the SCSI commands that ST173404FC drives support.
44 Table 14: Cheetah 73FC Product Manual, Rev.
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46 Cheetah 73FC Product Manual, Rev. C 9.3.1 Inquiry data Table 15 lists the Inquiry command data that the drive should return to the initiator per the format given in the Fibre Channel Interface Manual.
Cheetah 73FC Product Manual, Rev. C 47 4. Changeable values Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and saved values can be changed by a Mode Select command. A one (1) indicates the value can be changed. A zero (0) indicates the value is not changeable. For example, in Table 16, refer to Mode page 81, in the row entitled “CHG.” These are hex numbers representing the changeable values for Mode page 81.
48 Table 16: Cheetah 73FC Product Manual, Rev.
Cheetah 73FC Product Manual, Rev. C 9.4 49 Miscellaneous operating features and conditions Table 17 lists various features and conditions. A “Y” in the support column indicates the feature or condition is supported. An “N” in the support column indicates the feature or condition is not supported.
50 9.5 Cheetah 73FC Product Manual, Rev. C FC-AL physical interface Figure 12 shows the location of the J1 Fibre Channel single connection attachment (FC-SCA) and the J6 connector. Figure 14 provides the dimensions of the FC-SCA. Figure 15 provides the dimensions of the J6 connector. Details of the physical, electrical, and logical characteristics are provided within this section. The operational aspects of Seagate’s Fibre Channel drives are provided in the Fibre Channel Interface Manual.. J6 Figure 12.
Cheetah 73FC Product Manual, Rev. C 9.5.2 51 Connector requirements Recommended mating SCA part number: Part description Positions Part number Features AMP Vertical (SCA sequence) 40 787317-1 With polarization Berg 40 71781 With polarization Methode 40 512-220-91-101N With polarization Molex 40 717431040 With polarization The FC-AL SCA device connector is illustrated in Figure 14. The J6 connector is illustrated in Figure 15. 1.618 ± .003 in (41.1 ± 0.08 mm) Pin 20 Pin 40 Pin 1 0.
52 Cheetah 73FC Product Manual, Rev. C 9.5.3 Electrical description Fibre Channel drives use the FC-SCA connector for: • • • • • DC power FC-AL interface Drive select (device identification) Option selection Enclosure Services interface This 40-pin connector is designed to plug directly into a backpanel. External cables are not required. 9.5.4 Pin descriptions This section provides a pin-out of the FC-SCA and a description of the functions provided by the pins.
Cheetah 73FC Product Manual, Rev. C 9.5.5 53 FC-AL transmitters and receivers A typical FC-AL differential copper transmitter and receiver pair is shown in Figure 16. The receiver is required to provide the AC coupling to eliminate ground shift noise. .01µf 68 TX Transmitter TY RX 150 Differential Transfer Medium 9.5.6 Receiver RY 68 .01µf 150 Figure 16. 150 FC-AL transmitters and receivers Power Power is supplied through the FC-SCA with support for +5 volts and +12 volts.
54 Cheetah 73FC Product Manual, Rev. C The Active LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper +5 volt supply through an appropriate current limiting resistor. The LED and the current limiting resistor are external to the drive. 9.5.9 Enable port bypass signals The – Enable Bypass Port A (– EN BYP Port A) and – Enable Bypass Port B (– EN BYP Port B) signals control the port bypass circuits (PBC) located external to the disc drive.
Cheetah 73FC Product Manual, Rev. C 9.5.11.1 55 Parallel Enclosure Services Interface (ESI) The parallel ESI line is an output from the drive. This line provides the enclosure with an indication of the present function of the SEL lines. A high level, the default state, indicates the drive requires address information on the SEL lines. A low level indicates the drive is attempting an ESI transfer. The enclosure may not support ESI on any or all drive locations. It may only support the address function.
56 Table 23: Cheetah 73FC Product Manual, Rev.
Cheetah 73FC Product Manual, Rev. C 9.6 57 Signal characteristics This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 19 on page 52 for signal type and signal name information. 9.6.1 TTL input characteristics Table 24 provides the TTL characteristics. Table 24: TTL characteristics State Voltage Current Input high 1.9 < VIH < 5.5V IIH = ±500nA max. Input low -0.5V < VIL < 0.9V IOL = ±500nA max. Output high (-EN Bypass A, B) 2.
58 Cheetah 73FC Product Manual, Rev. C Figure 17 provides the data output valid eye diagram relative to the bit cell time. Table 28 lists the data values. Vout (mv) Bit Time XMIT Eye Figure 17. Transmit eye diagram 9.6.4 Differential PECL input The serial PECL input signal voltage characteristics are provided in Table 27. Table 27: Differential PECL input characteristics Description Parameter Notes Serial input voltage swing 400 < Vin < 2.
Cheetah 73FC Product Manual, Rev. C 10.0 59 Seagate Technology support services Online Services Internet www.seagate.com for information about Seagate products and services. Worldwide support is available 24 hours daily by e-mail for your disc or tape questions. Presales Support: Disc: http://www.seagate.com/support/email/email_presales.html or DiscPresales@Seagate.com. Tape: http://www.seagate.com/support/email/email_tape_presales.html or Tape_Sales_Support@Seagate.com.
60 Cheetah 73FC Product Manual, Rev. C Technical Support If you need help installing your drive, consult your dealer. Dealers are familiar with their unique system configurations and can help you with system conflicts and other technical issues. If you need additional help, you can talk to a Seagate technical support specialist. Before calling, note your system configuration and drive model number (ST####). SeaTDD™ (+1-405-936-1687) is a telecommunications device for the deaf (TDD).
Cheetah 73FC Product Manual, Rev. C 61 European Support Services For European customer support, dial the toll-free number for your specific country for presales support, technical support, SeaFAX and warranty service. If your country is not listed here, dial our European call center at +31-20-316-7222 from 8:30 A.M. to 5:00 P.M. (European central time) Monday through Friday. The European call center is located in Amsterdam, The Netherlands.
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64 data valid eye 58 Date code page command 43 DC power 52 requirements 21 defect and error management 31 deferred error handling 49 description 5 DEV_CTRL_CODE 55 device control code values 55 device control codes 55 device selection IDs 33 devices 33 differential PECL input 58 dimensions 29 Disable page out command 44 disc rotation speed 9 Disconnect/reconnect control (page 02h) command 43 Download microcode and save modes (5) 44 Download microcode mode (4) 44 Download microcode with offsets and save mode
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66 Good 49 Intermediate/condition met/good 49 Intermediate/good 49 Reservation conflict 49 Task set full 49 miscorrected media data 13 Mode select (10) command 45 command 43 Mode sense (10) command 45 command 43 data, table 46, 48 monitoring state 15 motor start controls 54 option 10 mounting 35 holes 35 orientations 34 mounting configuration 29 mounting configuration dimensions 29 MTBF 13, 14, 24 defined 14 N N_Port Login (PLOGI) 37 payload 38 payload values 39 NN 38, 41 Node Name 41 Node name 38 noise au
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68 allowable for non-flat surface 35 switches 33 Synchronize cache command 44 synchronized spindle operation 49 system chassis 36 T target reset function 37 task management functions 37 Abort task set 37 Clear ACA 37 Clear task set 37 Target reset 37 terminate task 37 task management response codes 37 Function complete 00 37 Function not supported 05 37 Function reject 04 37 task set full status 49 technical support services 59 temperature 24, 34 ambient 24 case 24 gradient 24 limits 24 non-operating 25 PC
Seagate Technology, LLC 920 Disc Drive, Scotts Valley, California 95066-4544, USA Publication Number: 83329482, Rev.
