Fujitsu MAP3735FC, MAP3147FC manual Logical Data Block Addressing, Format capacity

Page 45

3.2 Logical Data Block Addressing

3.1.5Format capacity

The size of the usable area for storing user data on the IDD (format capacity) varies according to the logical data block or the size of the spare sector area. Table 3.2 lists examples of the format capacity when the typical logical data block length and the default spare area are used. The following is the general formula to calculate the format capacity.

[Number of sectors of each zone] = [number of sectors per track ⋅ number of tracks per cell – number of alternate spare sectors per cell] ⋅ [number of cells in the zone]

[Formatted capacity] = [total of sectors of all zones] ⎟ [number of physical sectors in logical block] ⋅ [logical data block length]

The following formula must be used when the number of logical data blocks are specified with the parameter in the MODE SELECT or MODE SELECT EXTENDED command.

[Format capacity] = [logical data block length] ⋅ [number of logical data blocks]

The logical data block length, the maximum logical block address, and the number of the logical data blocks can be read out by a READ CAPACITY, MODE SENSE, or MODE SENSE EXTENDED command after initializing the disk medium.

Table 3.2 Format capacity

Model

Data heads

Data block length

User blocks

Format capacity (GB)

 

 

 

 

 

MAP3147FC

8

512

287,132,440

147.01

 

 

 

 

MAP3735FC

4

143,571,316

73.50

 

 

 

 

 

 

Note:

Total number of spare sectors is calculated by adding the number of spare sectors in each primary cylinder and the number of sectors in the alternate cylinders.

3.2Logical Data Block Addressing

Independently of the physical structure of the disk drive, the IDD adopts the logical data block addressing as a data access method on the disk medium. The IDD relates a logical data block address to each physical sector at formatting. Data on the disk medium is accessed in logical data block units. The INIT specifies the data to be accessed using the logical data block address of that data.

The logical data block addressing is a function whereby individual data blocks are given addresses of serial binaries in each drive.

C141-E163

3-9

Image 45
Contents MAP3147FC MAP3735FC Disk Drives PRODUCT/MAINTENANCE Manual For Safe Operation Overview of Manual PrefaceConventions for Alert Messages PrefaceC141-E163 Iii This page is intentionally left blank Important Alert Messages Important Alert ItemsImportant Alert Items C141-E163 Vii This page is intentionally left blank Product Maintenance ManualThis page is intentionally left blank Referenced Standards This page is intentionally left blank Contents Contents InstallationAppendix a Connector Signal Allocation Illustrations Tables This page is intentionally left blank General Description Standard Features Hardware Structure System ConfigurationGeneral Description Standard FeaturesStandard Features General Description FC model drives outer view Hardware StructureMAP3147FC MAP3735FC Disk/head configurationExample of FC-AL system configuration System ConfigurationGeneral Description Hardware Specifications Model name and order number Hardware SpecificationsModel names and order numbers MAP3147FCFunction specifications Specifications32/34 Meeprml FC-ALHardware Specifications Environmental specifications Environmental/power requirementsIops Reliability Error rateMTBF= Hardware Specifications This page is intentionally left blank Cylinder configuration Data Space Logical Data Block Addressing Defect ManagementData Space SAS69 Data FormatZone layout and track capacity Data SpaceAlternate spare area Track format Data SpaceMsec Servo frame = 241 zone 0 ~ 408 zone Sector format Track skew/head skewData Format Format capacity Logical Data Block AddressingData Format Defect Management Defect Management Defect listAlternate block allocation Alternate block allocation by Format Unit command Alternate block allocation by Reassign Blocks command Write Write Extend Defect Management This page is intentionally left blank Mounting Requirements External dimensions Installation RequirementsInstallation Requirements Mounting Mounting RequirementsMounting frame structure Surface temperature check point HDCMPU Service clearance area Current waveform +12 VDC Power Supply RequirementsAC noise filter recommended Connection Requirements Connection Requirements Connector10 SCA2 type connector Installation Installation Setting Loop ID setting SettingMode settings Motor start modeMounting Drives Mounting procedures Dismounting Drives Installation Checking connection Checking the IDD connection a Checking the IDD connection B Formatting C141-E163 Setting parameters Arre AwreArre Awre PER Disc XffffXxxx Read/write Self-diagnostic functions Diagnostics Self-diagnosticsDiagnostics and Maintenance Diagnostics Test programs Maintenance Information Precautions Maintenance InformationMaintenance requirements Maintenance Information Maintenance levels Revision label example Revision numbersTests Indicating revision numbers Tools and test equipmentTest flowchart Diagnostic test Operation Check Initial seek operation checkOperation test Troubleshooting with disk drive replacement in the field Troubleshooting ProceduresSystem-level field troubleshooting Disk drive troubleshooting Troubleshooting at the repair siteFinding possibly faulty parts Troubleshooting with parts replacement in the factoryError Analysis Information Collection Sense Data Analysis Error Analysis Information Collection Sense dataSense key, sense code, and subsense code ILI Error AnalysisLSB SksvDefinition of sense data Sense Data AnalysisSense data 3-0C-03, 4-40-xx, 4-44-xx, and 4-C4-xx Sense data 1-1x-xx, 3-1x-xx and E-1D-00 Disk read errorInterface FC-SCA Connector Signal Allocation Appendix a Connector Signal AllocationConnector Signal Allocation Glossary Target Targ GlossaryAcronyms and Abbreviations RSV Acronyms and AbbreviationsECC BcrcIndex Mode SELECT/MODEMtbf Mttr PADC141-E163 IN-3 This page is intentionally left blank Fujitsu Canada INC This page is intentionally left blank READER’S Comment Form This page is intentionally left blank

MAP3735FC, MAP3147FC specifications

Fujitsu has been a prominent player in the hard disk drive market, with its MAP3147FC and MAP3735FC models standing out in terms of performance and reliability. These drives are engineered to meet the growing demands of enterprise applications, providing robust solutions for data storage in critical environments.

The Fujitsu MAP3147FC, with a capacity of 147 GB, is optimized for high-speed data access and storage efficiency. This 3.5-inch SCSI drive operates at a rotational speed of 15,000 RPM, ensuring rapid data retrieval and minimized latency, making it ideal for applications requiring quick transaction processing. It features a 4 Gbps Fibre Channel interface, which enhances connectivity and system integration, promoting seamless communication between devices in storage area networks.

On the other hand, the MAP3735FC model offers a higher capacity of 300 GB. It shares similar specifications with its counterpart, including the 15,000 RPM speed, which guarantees top-notch performance for mission-critical applications. The MAP3735FC, like the MAP3147FC, incorporates advanced technologies such as Command Queuing, which optimizes the execution of multiple read and write commands in a queue. This feature is particularly beneficial in environments with high I/O demands, improving overall system throughput and efficiency.

Both drives utilize sophisticated error correction techniques, ensuring data integrity and reliability. They are equipped with features like S.M.A.R.T. (Self-Monitoring, Analysis, and Reporting Technology), which continuously monitors the health of the drives and helps predict potential failures, allowing for proactive maintenance and data protection.

In terms of physical characteristics, both models are designed to withstand the rigors of continuous operation. They are built with a rugged casing to protect against vibration and shock, making them suitable for use in enterprise-level servers and storage systems. Their design also allows for efficient heat dissipation, which is critical for maintaining optimal performance during extended use.

In summary, Fujitsu's MAP3147FC and MAP3735FC hard drives embody a combination of high speed, reliability, and advanced features tailored for enterprise environments. Their robust performance, large storage capacities, and reliable error correction technologies make them an excellent choice for businesses looking to optimize their data storage solutions and ensure seamless operation in demanding applications. With Fujitsu's commitment to quality and innovation, these models continue to meet the evolving needs of the data storage industry.