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PRODUCT SPECIFICATIONS

3 – 2

Physical Dimensions (maximum)

Figure 3 - 1

Outline and Mounting Dimensions

PARAMETER

STANDARD

METRIC

Height

1.028 inches

2 6 . 1 m i l l i m e t e r s

L e n g t h

5.787 inches

1 4 7 m i l l i m e t e r s

W i d t h

4.00 inches

101.6 millimeters

Weight

1.3 pounds

0 . 5 9 k i l o g r a m s

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Summary of Contents for 30768H1

Page 1: ...rks of Maxtor Corporation Other brands or products are trademarks or registered trademarks of their respective holders Contents and specifications subject to change without notice All rights reserved Corporate Headquarters 510 Cottonwood Drive Milpitas California 95035 Tel 408 432 1700 Fax 408 432 4510 Research and Development Center 2190 Miller Drive Longmont Colorado 80501 Tel 303 651 6000 Fax 3...

Page 2: ...ctro static discharge ESD precautions including personnel and equipment grounding Stand alone drives are sensitive to ESD damage 2 BEFORE removing drives from their packing material allow them to reach room temperature 3 During handling NEVER drop jar or bump a drive 4 Once a drive is removed from the Maxtor shipping container IMMEDIATELY secure the drive through its mounting holes within a chassi...

Page 3: ... 2 2 Zone Density Recording 2 2 Read Write Multiple Mode 2 2 UltraDMA Mode 4 2 2 Multi word DMA EISA Type B Mode 2 2 2 Sector Address Translation 2 2 Logical Block Addressing 2 3 Defect Management Zone 2 3 On the Fly Hardware Error Correction Code ECC 2 3 Software ECC Correction 2 3 Automatic Head Park and Lock Operation 2 3 Cache Management 2 4 Buffer Segmentation 2 4 Read Ahead Mode 2 4 Automati...

Page 4: ... Design Life 3 4 EMC EMI 3 5 EMC Compliance 3 5 Canadian Emissions Statement 3 5 Safety Regulatory Compliance 3 5 Section 4 Section 4 Section 4 Section 4 Section 4 Handling and Installation Handling and Installation Handling and Installation Handling and Installation Handling and Installation Hard Drive Handling Precautions 4 1 Electro Static Discharge ESD 4 1 Unpacking and Inspection 4 2 Repackin...

Page 5: ...r Count Register 6 2 Sector Number Register 6 2 Cylinder Number Registers 6 2 Device Head Register 6 2 Status Register 6 2 Command Register 6 3 Read Commands 6 3 Write Commands 6 3 Mode Set Check Commands 6 3 Power Mode Commands 6 3 Initialization Commands 6 3 Seek Format and Diagnostic Commands 6 3 S M A R T Commands 6 3 Summary 6 4 Control Diagnostic Registers 6 5 Alternate Status Register 6 5 D...

Page 6: ...Immediate 7 8 Idle Immediate 7 8 Standby 7 8 Idle 7 8 Check Power Mode 7 8 Set Sleep Mode 7 8 Default Power on Condition 7 9 Initialization Commands 7 10 Identify Drive 7 10 Initialize Drive Parameters 7 13 Seek Format and Diagnostic Commands 7 14 S M A R T Command Set 7 15 Section 8 Section 8 Section 8 Section 8 Section 8 Service and Support Service and Support Service and Support Service and Sup...

Page 7: ...r 5 1 5 2 PIO Data Transfer to from Device 5 3 5 3 Multi word DMA Data Transfer 5 4 5 4 Initiating an Ultra DMA Data In Burst 5 5 5 5 Sustained Ultra DMA Data In Burst 5 6 5 6 Host Pausing an Ultra DMA Data In Burst 5 6 5 7 Device Terminating an Ultra DMA Data In Burst 5 7 5 8 Host Terminating an Ultra DMA Data In Burst 5 7 5 9 Initiating an Ultra DMA Data Out Burst 5 8 5 10 Sustained Ultra DMA Da...

Page 8: ...le Service guarantee One call or a visit to our home page on the Internet http www maxtor com puts you in touch with either technical support or customer service We ll provide you the information you need quickly accurately and in the form you prefer a fax a downloaded file or a conversation with a representative Manual Organization This hard disk drive reference manual is organized in the followi...

Page 9: ... are shown in all uppercase type All signals are either high active or low active signals A dash character at the end of a signal name indicates that the signal is low active A low active signal is true when it is below ViL and is false when it is above ViH A signal without a dash at the end indicates that the signal is high active A high active signal is true when it is above ViH and is false whe...

Page 10: ...ications where disk storage value is paramount Available in capacities up to 30 GB the VL series provides the proven quality and reliability of the original DiamondMax products and includes an UltraDMA 100 interface 512 KB buffer and 9 5 ms seek performance DiamondMax VL 30 Key Features ANSI ATA 5 compliant PIO Mode 4 interface Enhanced IDE Supports Ultra DMA Mode 4 for up to 100 MB sec data trans...

Page 11: ... universal translate mode In an AT EISA class system the drive may be configured to any specified combination of cylinders heads and sectors within the range of the drive s formatted capacity DiamondMax VL 30 drives power up in a translate mode MODEL CYL HD S P T LZone WPcom MAX LBA CAPACITY 33073H4 59 554 16 63 60 030 432 30 735 MB 32305H3 44 666 16 63 45 023 328 23 051 MB 31536H2 29 777 16 63 30...

Page 12: ...on The data buffer is organized into two segments the data buffer and the micro controller scratch pad The data buffer is dynamically allocated for read and write data depending on the commands received A variable number of read and write buffers may exist at the same time Read Ahead Mode Normally this mode is active Following a read request disk read ahead begins on the first sector and continues...

Page 13: ...s up to eight head selection depending on the model read pre amplification and write drive circuitry Read Write Heads and Media Low mass low force giant magneto resistive read write heads record data on 3 5 inch diameter disks Maxtor uses a sputtered thin film medium on all disks for DiamondMax VL 30 drives Air Filtration System All DiamondMax VL 30 drives are assembled in a Class 100 controlled e...

Page 14: ...of I O addresses The drives are jumpered as device 0 or 1 Master Slave and are selected by the drive select bit in the Device Head register of the task file All Task File registers are written in parallel to both drives The interface processor on each drive decides whether a command written to it should be executed this depends on the type of command and which drive is selected Only the drive sele...

Page 15: ... 662 Sectors per Drive 60 030 432 45 023 328 30 015 216 15 007 104 MODEL 33073H4 32305H3 31536H2 30768H1 Seek Times typical read Track to Track 1 0 ms Average performance 9 5 ms Average silent mode 15 ms Full Stroke 20 0 ms Average Latency 5 55 ms Rotational Speed 0 1 5 400 RPM Controller Overhead 0 3 ms Data Transfer Rate To From Interface UltraDMA M4 up to 100 MB sec To From Interface PIO 4 Mult...

Page 16: ...cal Dimensions maximum Figure 3 1 Outline and Mounting Dimensions PARAMETER STANDARD METRIC Height 1 028 inches 26 1 millimeters Length 5 787 inches 147 millimeters Width 4 00 inches 101 6 millimeters Weight 1 3 pounds 0 59 kilograms ...

Page 17: ...tive A software or hardware reset is required to return the drive to the Standby state EPA Energy Star Compliance Maxtor Corporation supports the goals of the U S Environmental Protection Agency s Energy Star program to reduce the electrical power consumption of computer equipment Environmental Limits PARAMETER OPERATING NON OPERATING STORAGE Temperature 5 C to 55 C low temperature 40 C high tempe...

Page 18: ...verable Average data error rate allowed with all error recovery features activated Component Design Life 5 years minimum Component design life is defined as a the time period before identified wear out mechanisms impact the failure rate or b the time period up to the wear out point when useful component life expires Shock and Vibration PARAMETER OPERATING NON OPERATING Mechanical Shock 30 Gs 2 0 m...

Page 19: ...pical personal computer Maxtor recommends that testing and analysis for EMC compliance be performed with the disk mechanism installed within the user s end use application Canadian Emissions Statement This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian department of communication...

Page 20: ...d some of the problems associated with ESD Maxtor advises that anyone handling a disk drive use a wrist strap with an attached wire connected to an earth ground Failure to observe these precautions voids the product warranty Manufacturers frequently experience unsolved component hardware malfunctions often caused by ESD To reduce the incidence of ESD related problems Maxtor recommends that any ele...

Page 21: ...of damage in transit Notify the carrier immediately in case of damage to the shipping container As they are removed inspect drives for evidence of shipping damage or loose hardware If a drive is damaged and no container damage is evident notify Maxtor immediately for drive disposition Figure 4 1 Multi pack Shipping Container ...

Page 22: ...lation Recommended Mounting Configuration The DiamondMax drive design allows greater shock tolerance than that afforded by larger heavier drives The drive may be mounted in any attitude using four size 6 32 screws with 1 8 inch maximum penetration and a maximum torque of 5 inch pounds See Figure 3 1 for mounting dimensions Allow adequate ventilation to the drive to ensure reliable operation See th...

Page 23: ...Maxtor recommends Drives less than or equal to 8 4 GB 486 DX 66 MHz Drives larger than 8 4 GB Pentium class processor Operating System Requirements Drives less than or equal to 8 4 GB DOS 5 0 or higher Drives larger than 8 4 GB Installing as boot drive Primary Master requires full installation set of Windows 95 98 not an update from DOS or Windows 3 x Installing as non boot drive Primary Slave Sec...

Page 24: ...e is pin 1 After attaching the IDE interface cable and the power cable to the Maxtor hard drive verify that all other cables connected to other devices the mother board or interface card s are correctly seated Striped colored edge is pin Start up Turn your system ON During the system start up sequence run the SETUP BIOS program Newer systems usually display a message like press DEL to enter Setup ...

Page 25: ... cable length 18 inches Figure 5 1 Data Connector Pin Description Summary PIN SIGNAL PIN SIGNAL 01 Reset 02 Ground 03 DD7 04 DD8 05 DD6 06 DD9 07 DD5 08 DD10 09 DD4 10 DD11 11 DD3 12 DD12 13 DD2 14 DD13 15 DD1 16 DD14 17 DD0 18 DD15 19 Ground 20 keypin 21 DMARQ 22 Ground 23 DIOW STOP 24 Ground 25 DIOR HDMARDY HSTROBE 26 Ground 27 IORDY DDMARDY DSTROBE 28 CSEL 29 DMACK 30 Ground 31 INTRQ 32 IOCS16 ...

Page 26: ...ycles DMA ready during UltraDMA data out bursts Data strobe during UltraDMA data in bursts CSEL 28 Cable Select Used for Master Slave selection via cable Requires special cabling on host system and installation of Cable Select jumper DMACK 29 I DMA Acknowledge This signal is used with DMARQ for DMA transfers By asserting this signal the host is acknowledging the receipt of data or is indicating th...

Page 27: ...n 60 ns 45 ns 30 ns 30 ns 20 ns t4 DIOW data hold min 30 ns 20 ns 15 ns 10 ns 10 ns t5 DIOR data setup min 50 ns 35 ns 20 ns 20 ns 20 ns t6 DIOW data hold min 5 ns 5 ns 5 ns 5 ns 5 ns t6Z DIOR data tristate max 30 ns 30 ns 30 ns 30 ns 30 ns t9 DIOR DIOW to address valid hold min 20 ns 15 ns 10 ns 10 ns 10 ns tRd Read Data Valid to IORDY active min 0 0 0 0 0 tA IORDY Setup Time 35 ns 35 ns 35 ns 35...

Page 28: ...s tG DIOR DIOW data setup min 100 ns 30 ns 20 ns tH DIOW data hold min 20 ns 15 ns 10 ns tI DMACK to DIOR DIOW setup min 0 0 0 tJ DIOR DIOW to DMACK hold min 20 ns 5 ns 5 ns tKr DIOR negated pulse width min 50 ns 50 ns 25 ns tKw DIOW negated pulse width min 215 ns 50 ns 25 ns tLr DIOR to DMARQ delay max 120 ns 40 ns 35 ns tLw DIOW to DMARQ delay max 40 ns 40 ns 35 ns tZ DMACK to tristate max 20 ns...

Page 29: ...aximum time allowed for outputs to release 10 10 10 10 10 tZAH Minimum delay time required for output drivers turning on from released state 20 20 20 20 20 tZAD 0 0 0 0 0 tENV Envelope time all control signal transitions are within the DMACK envelope by this much time 20 70 20 70 20 70 20 55 20 55 tSR STROBE to DMARDY response time to ensure the synchronous pause case when the recipient is pausing...

Page 30: ...tDVH DSTROBE at device DD 15 0 at device DSTROBE at host DD 15 0 at host tDVH tCYC tCYC tDVS tDVS tDH tDS tDH tDS t2CYC tDH tDVH t2CYC DMARQ device DMACK host STOP host HDMARDY host DSTROBE device DD 15 0 device tSR tRFS tRP Figure 5 6 Host Pausing an Ultra DMA Data In Burst ...

Page 31: ...0 CS1 tACK tLI tMLI tDVS tLI tACK tACK tZAH tDVH tSS tLI Figure 5 7 Device Terminating an Ultra DMA Data In Burst tDVH CRC tAZ DMARQ device DMACK host STOP host HDMARDY host DSTROBE device DD 15 0 DA0 DA1 DA2 CS0 CS1 tACK tMLI tLI tLI tIORDYZ tACK tACK tZAH tMLI tDVS tRFS tRP Figure 5 8 Host Terminating an Ultra DMA Data In Burst ...

Page 32: ... device tDVH tCYC tCYC tDVS tDVS tDS tDH t2CYC tDH tDVH t2CYC DMARQ device DMACK host STOP host DDMARDY device HSTROBE host DD 15 0 host DA0 DA1 DA2 CS0 CS1 tUI tACK tENV tZIORDY tLI tDVS tDVH tACK tACK tUI Figure 5 9 Initiating an Ultra DMA Data Out Burst Figure 5 10 Sustained Ultra DMA Data Out Burst ...

Page 33: ... DD 15 0 host tSR tRFS tRP Figure 5 11 Device Pausing an Ultra DMA Data Out Burst DMARQ device DMACK host STOP host DDMARDY device HSTROBE host DD 15 0 host DA0 DA1 DA2 CS0 CS1 tACK tLI tMLI tDVS tLI tLI tACK tIORDYZ tACK CRC tDVH tSS Figure 5 12 Host Terminating an Ultra DMA Data Out Burst ...

Page 34: ...N 5 10 DMARQ device DMACK host STOP host DDMARDY device HSTROBE host DD 15 0 host DA0 DA1 DA2 CS0 CS1 tACK tMLI tDVS tLI tLI tACK CRC tDVH tACK tIORDYZ tMLI tRP tRFS Figure 5 13 Device Terminating an Ultra DMA Data Out Burst ...

Page 35: ...erpretation differs depending on whether the controller is in operational or diagnostic mode A power up reset software reset or receipt of a diagnostic command sets the controller into diagnostic mode This mode invalidates contents of the Status register The contents of the Error register reflect a completion code Issuing any command apart from a Diagnostic command places the controller into opera...

Page 36: ...owsfortheRead Writeandtranslatecommand CONTENTS LBA BITS Sector Number 0 7 Cylinder Low 8 15 Cylinder High 16 23 Drive Head 24 27 Drive Select Set to 0 to select the master drive set to 1 to select the slave drive Head Select Specifies the binary coded address of the head to be selected Status Register Contains results of the last command executed and the drive s status The other seven Task File r...

Page 37: ...C9h No retries Write Commands Write Sector s 30h Normal writes retries enabled 31h Normal writes retries disabled 32h Write Long retries enabled 33h Write Long retries disabled Write Verify Sector s 3Ch Write Sector Buffer E8h Write Multiple C5h Write DMA CAh CBh No retries Mode Set Check Commands Set Features EFh Set Multiple Mode C6h Read Native Max Address F8h Set Max Mode F9h Power Mode Comman...

Page 38: ...Y Y Read Verify Sector s 0 1 0 0 0 0 0 x N Y Y Y Y Format Track 0 1 0 1 0 0 0 0 N N N Y Y S e e k 0 1 1 1 x x x x N N Y Y Y Execute Diagnostic 1 0 0 1 0 0 0 0 N N N N D Initialize Parameters 1 0 0 1 0 0 0 1 N Y N N Y Read Sector Buffer 1 1 1 0 0 1 0 0 N N N N D Write Sector Buffer 1 1 1 0 1 0 0 0 N N N N D Identify Drive 1 1 1 0 1 1 0 0 N N N N D S e t F e a t u r e s 1 1 1 0 1 1 1 1 Y N N N D Rea...

Page 39: ...tive for a minimum of 5 µsec IRQ Enable Setting the Interrupt Request Enable to 0 enables the IRQ 14 signal to the host When this bit is set to 1 IRQ14 is tri stated and interrupts to the host are disabled Any pending interrupt occurs when the bit is set to 0 The default state of this bit after power up is 0 interrupt enabled Digital Input Register Contains information about the state of the drive...

Page 40: ...et clears and the drive completes initialization Completion of a reset operation does not generate a host interrupt Task File registers are initialized as follows Error 1 Sector Count 1 Sector Number 1 Cylinder Low 0 Cylinder High 0 Drive Head 0 Interrupt Handling The drive requests data transfers to and from the host by asserting its IRQ 14 signal This signal interrupts the host if enabled by bit...

Page 41: ...fer Read DMA Multi word DMA Ultra DMA Read Multiple Set Multiple Write Commands Write Sector s Write Verify Sector s Write Sector Buffer Write DMA Multi word DMA Ultra DMA Write Multiple Mode Set Check Commands Set Features Mode Set Multiple Mode Set Max Mode Read Native Max Address Power Mode Commands Standby Immediate Idle Immediate Standby Idle Check Power Mode Set Sleep Mode Initialization Com...

Page 42: ... contain the numbers of the cylinder head and sector of the last sector read Back to back sector read commands set DRQ and generate an interrupt when the sector buffer is filled at the completion of each sector The drive is then ready for the data to be read by the host DRQ is reset and BSY is set immediately when the host empties the sector buffer If an error occurs during Read Sector commands th...

Page 43: ...CTOR S command except that 1 Several sectors are transferred to the host as a block without intervening interrupts 2 DRQ qualification of the transfer is required only at the start of each block not of each sector The block count consists of the number of sectors to be transferred as a block The block count is programmed by the Set Multiple Mode command which must be executed prior to the Read Mul...

Page 44: ...mber of the last sector written The next time the buffer is ready to be filled during back to back Write Sector commands DRQ is set and an interrupt is generated After the host fills the buffer DRQ is reset and BSY is set If an error occurs Write Sector operations terminate at the sector containing the error The Command Block registers then contain the numbers of the cylinder head and sector where...

Page 45: ... commands report after the attempted disk write of the block or partial block in which the error occurred The write operation ends with the sector in error even if it was in the middle of a block When an error occurs subsequent blocks are not transferred When DRQ is set at the beginning of each full and partial block interrupts are generated Write DMA Multi word DMA Identical to the Write Sector s...

Page 46: ...nced Power Management 42h Enable Automatic Acoustic Management The sector count register contains the Automatic Acoustic Management level SECTOR LEVEL FFh Maxtor specific FEh Maximum performance 81h FDh Intermediate acoustic management levels 80h Minimum acoustic emanation level 00h 7Fh reserved 44h Length of data appended on Read Long Write Long commands specified in the Identify Device informati...

Page 47: ...ter this sub command is completed any other SET MAX commands except SET MAX UNLOCK and SET MAX FREEZE LOCK are rejected The drive remains in this state until a power cycle or the acceptance of a SET MAX UNLOCK or SET MAX FREEZE LOCK command Set Max Unlock This sub command requests a transfer of a single sector of data from the host The password supplied in the sector of data transferred will be co...

Page 48: ...E3h Spin up and change time out value This command will spin up the spin motor if the drive is spun down If the drive is already spinning the spin up sequence is not executed A non zero value placed in the Sector Count register will enable the Automatic Power Down sequence and their timer will begin counting down immediately A value of zero placed in the Sector Count register will disable the Auto...

Page 49: ...iplied by five seconds to obtain the Time out Interval value If no drive commands are received from the host within the Time out Interval the drive automatically enters the STANDBY mode The minimum value is 5 seconds While the drive is in STANDBY MODE any commands received from the host are accepted and executed as they would in normal operation except that the spin motor is started if required to...

Page 50: ... or device 5 3 retired 2 response incomplete 1 retired 0 reserved 1 Number of logical cylinders 2 Reserved 3 Number of logical heads 4 5 Retired 6 Number of logical sectors per logical track 7 8 Reserved 9 Retired 10 19 Drive serial number 20 ASCII characters 20 21 Retired 22 Obsolete 23 26 Firmware revision 8 ASCII characters 27 46 Model number 40 ASCII characters 47 Maximum number of sectors tha...

Page 51: ...rd DMA transfer modes supported 64 15 8 reserved 7 0 advanced PIO transfer modes supported 65 Minimum multi word DMA transfer cycle time per word 15 0 cycle time in nanoseconds 66 Manufacturer s recommeded multi word DMA transfer cycle time 15 0 cycle time in nanoseconds 67 Minimum PIO transfer cycle time without flow control 15 0 cycle time in nanoseconds 68 Minimum PIO transfer cycle time with I...

Page 52: ...bled 0 1 SMART feature set enabled 86 Command sets supported If words 82 and 83 0000h or FFFFh command set notification not supported 15 10 as currently defined 9 1 Automatic Acoustic Management feature set supported 8 0 as currently defined 88 Ultra DMA 15 13 reserved 12 1 Ultra DMA mode 4 is selected 0 Ultra DMA mode 4 is not selected 11 1 Ultra DMA mode 3 is selected 0 Ultra DMA mode 3 is not s...

Page 53: ...mand the drive 1 Sets BSY 2 Saves the parameters 3 Resets BSY and 4 Generates an interrupt To specify maximum heads write 1 less than the maximum e g write 4 for a 5 head drive To specify maximum sectors specify the actual number of sectors e g 17 for a maximum of 17 sectors track The sector count and head values are not checked for validity by this command If they are invalid no error will be pos...

Page 54: ...command execution If the drive is not already on the desired track an implied seek is performed Once at the desired track the data fields are written with all zeroes Execute Drive Diagnostic Commands the drive to implement the internal diagnostic tests These tests are executed only upon command receipt they do not run automatically at power up or after a reset The drive sets BSY immediately upon r...

Page 55: ...of attribute information to the host D1h S M A R T Read Attribute Thresholds This feature returns 512 bytes of warranty failure thresholds to the host D2h Enable Disable Autosave To enable this feature set the sector count register to F1h enable or 0 disable Attribute values are automatically saved to non volatile storage on the device after five minutes of idle time and before entering idle sleep...

Page 56: ...and returns Here s how it works 1 Customer calls 1 800 2MAXTOR for a Return Material Authorization RMA number and provides a credit card number 2 Maxtor ships a replacement drive within 2 business days and 3 Customer returns the original drive and credit card draft is destroyed Support Technical Assistance Highly trained technicians are available 6 a m to 6 p m Mountain Standard Time Monday throug...

Page 57: ... Maxtor products are backed by No Quibble Service the benchmark for service and support in the industry Customer Service is available 5 a m to 5 p m Pacific Standard Time Monday through Friday U S and Canada Language support English Spanish Voice 800 2MAXTOR press 2 800 262 9867 E mail RMA maxtor com Fax 408 922 2085 Europe Language support English French German Voice 353 1 286 62 22 E mail Eurote...

Page 58: ...sity BLOCK A group of bytes handled stored and accessed as a logical data unit such as an individual file record BUFFER A temporary data storage area that compensates for a difference in data transfer rates and or data processing rates between sender and receiver BUS A collection of functionally parallel conductors that forms an interconnection between functional blocks in a digital device A lengt...

Page 59: ...a DC write erase current through either a Read Write or Erase head DIGITAL Any system that processes digital binary signals having only values of a 1 or 0 usually in bits and bytes rather than analog signals signals that can have many values DIGITALMAGNETICRECORDING See magnetic recording DIRECTACCESS Access directly to memory location See random access DIRECTMEMORYACCESS A mean of data transfer b...

Page 60: ...eive magnetic flux Sometimes the term is all inclusive to mean the carriage assembly which includes the slider and flexure HEADCRASH The inadvertent touching of a disk by a head flying over the disk may destroy a portion of the media and or the head HEADDISKASSEMBLY HDA The mechanical portion of a rigid fixed disk drive It usually includes disks heads spindle motor and actuator HEADLOADINGZONE The...

Page 61: ...ly related to the rotational period of a disk 2 A recording code such as FM MFM or RLL to translate between flux reversals and bits or bytes N NON RETURNTOZERO A form of data encoding that is not self clocking in other words it needs to be provided with an external bit cell clock signal Generally used in higher performance disk drives O OFF LINE processing or peripheral operations performed while ...

Page 62: ...sks RUN LENGTHLIMITEDENCODING A recording code Sometimes meant to denote 2 7 RLL which can signify 1 5 times the bits as MFM given the same number of flux reversals in a given lineal distance S SECTOR A logical segment of information on a particular track The smallest addressable unit of storage on a disk Tracks are made of sectors SECTORPULSESIGNAL A digital signal pulse present in hard sectored ...

Page 63: ...OSITIONING The method both mechanical and electrical used to position the heads over the correct cylinder in a disk drive system U UN CORRECTABLEERROR An error that is not able to be overcome with Error Detection and Correction UNFORMATTEDCAPACITY Storage capacity of disk drive prior to formatting also called the gross capacity See format The raw capacity of a drive not taking into account the cap...

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