User manual HITACHI TRAVELSTAR (DHAA) DATASHEET

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Manual abstract: user guide HITACHI TRAVELSTAR (DHAA)DATASHEET

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[. . . ] Dhax. txt ++++++++++++++++++++++++++++++++++++++++ | 2. 5" 270, 405 and 540 MB DISK DRIVE | | MODELS | | DHAA-2270, -2405, -2540 | | DHAS-2270, -2405, -2540 | ++++++++++++++++++++++++++++++++++++++++ AN OEM OFFERING FROM IBM The latest in IBM's 2. 5-inch line features the industry's highest capacity in a notebook product, with 540 MB available in a 2 platter design. [. . . ] The higher areal density gives a higher average data rate with reduced "tail-off" on the inner bands. Performance is further enhanced by a 64 KB segmented buffer with write-cache and read look ahead. The drives support both AT (IDE) at 8. 3 MB/sec and Fast-SCSI-2 at 10 MB/sec. The AT drives support LBA mode and extended cylinder addressing. In addition to the low power ratings, the drives also support AT and SCSI power management commands for "green PC" applications. QUALITY AND AVAILABILITY ======================== Advanced worldwide manufacturing facilities provides multisite, high-volume production capability. HIGHLIGHTS MR head technology 17 mm high AT (IDE) and SCSI-2F interfaces 3800 RPM 14 msec average seek 8. 3 MB/sec data rate (AT) 10. 0 MB/sec data rate (SCSI-2) 300, 00 poh MTBF Low power for extended notebook battery life PRODUCT DESCRIPTION _______________________________________________________________________________ 2 1/2-Inch 270, 405 and 540 MB Disk Drive _______________________________________________________________________________ Configuration Interface AT/SCSI-2F Device Capacity Formatted 270/405/540 MB (1) Sector Size 512 Bytes Recording Zone 8 User Cylinders 2788 Page 1 Dhax. txt Data Heads 2/3/4 Disks 1/2/2 Areal Density (max) 493 Mb/sq in Recording Density (max) 93, 100 BPI Track Density 5300 TPI _______________________________________________________________________________ Performance Rotational Speed 3800 RPM Media Transfer Rate 24. 5-35. 8 Mbits/sec Data Buffer Read 32 KB/Write 32 KB Interface Transfer Rate (Max) AT 8. 3 MB/sec SCSI 10. 0 MB/sec (sync) Latency Average 7. 9 msec Seek Time (Typical) Average (Read) 14 msec Track to Track 4. 0 msec Full Track 23 msec _______________________________________________________________________________ Reliability MTBF Projected power-on hours 300, 000 _______________________________________________________________________________ Power Requirements +5 VDC plus or minus 5% Dissipation (Typical) Start Up (Maximum Peak) 4. 7 Watts Seek 2. 0 Watts Read/Write 2. 8 Watts Idle 1. 2 Watts Standby 0. 4 Watts _______________________________________________________________________________ Physical Size Height 17 mm Width 70 mm Depth 100 mm Weight 180 g _______________________________________________________________________________ Environmental Characteristics Operating Non-Operating _______________________________________________________________________________ Ambient Temperature 5 to 55 degrees C -40 to 65 degrees C Relative Humidity Non-Condensing 8% to 90% 5% to 95% Maximum Wet Bulb Non-Condensing 29. 4 degrees C 40 degrees C Shock Half Sinewave 20 G/3 msec 250 G/2 msec Vibration Random (RMS) 0. 67 G (5-500 Hz) 1. 04 G (2-200 Hz) _______________________________________________________________________________ (1) 1 MB-1, 000, 000 bytes Product Description data represents IBM's design objectives and is provided for comparative purposes; actual results may vary depending on a variety of factors. [. . . ] Copywrite International Business Machines Corporation 1994 Page 2 Dhax. txt * IBM and AT are trademarks or registered trademarks of the International Business Machines Corporation. Page 3 [. . . ]

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