Assessments - 3, GPA: 4.7
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(6) Read/write circuit The read/write circuit uses a LSI chip for the read/write preamplifier. It improves data reliability by preventing errors caused by external noise. (7) Controller circuit The controller circuit consists of an LSI chip to improve reliability. The high- speed microprocessor unit (MPU) achieves a high-performance AT controller. 2.2 System Configuration 2.2.1 ATA interface Figures 2.3 and 2.4 show the ATA interface system configuration. The drive has a 44-pin PC AT interface connector and supports the PIO transfer at 16.6 MB/s (ATA-3, Mode 4), the DMA transfer at 16.6 MB/s (ATA-3, Multiword mode 2) and also the U-DMA at 33.3 MB/s (ATA-3, Mode 2). 2.2.2 1 drive connection MHC2032AT MHC2040AT MHD2021AT MHD2032AT Figure 2.3 1 drive system configuration C141-E050-02EN 2.2 System Configuration 2.2.3 2 drives connection (Host adaptor) MHC2032AT MHC2040AT MHD2021AT MHD2032AT MHC2032AT MHC2040AT MHD2021AT MHD2032AT Note: When the drive that is not conformed to ATA is connected to the disk drive above configuration, the operation is not guaranteed. Figure 2.4 2 drives configuration HA (host adaptor) consists of address decoder, driver, and receiver. ATA is an abbreviation of “AT attachment”. The disk drive is conformed to the ATA-3 interface. At high speed data transfer (PIO mode 3, mode 4, or DMA mode 2 U-DMA mode 2), occurence of ringing or crosstalk of the signal lines (AT bus) between the HA and the disk drive may be a great cause of the obstruction of system reliability. Thus, it is necessary that the capacitance of the signal lines including the HA and cable does not exceed the ATA-3 standard, and the cable length between the HA and the disk drive should be as short as possible. No need to push the top cover of the disk drive. If the over-power worked, the cover could be contacted with the spindle motor. Thus, that could be made it the cause of failure. C141-E050-02EN CHAPTER 3 Installation Conditions 3.1 Dimensions 3.2 Mounting 3.3 Cable Connections 3.4 Jumper Settings This chapter gives the external dimensions, installation conditions, surface temperature conditions, cable connections, and switch settings of the hard disk drives. C141-E050-02EN Installation Conditions 3.1 Dimensions Figure 3.1 illustrates the dimensions of the disk drive and positions of the mounting screw holes. All dimensions are in mm. MHD2032AT Figure 3.1 Dimensions (MHC series) (1/2) C141-E050-02EN 3.2 Mounting Figure 3.1 Dimensions (MHD series) (2/2) C141-E050-02EN Installation Conditions 3.2 Mounting (1) Orientation Figure 3.2 illustrates the allowable orientations for the disk drive. (a) Horizontal –1 (b) Horizontal –1 (c) Vertical –1 (d) Vertical –2 (e) Vertical –3 (f) Vertical –4 Figure 3.2 Orientation (Sample: MHC2040AT) C141-E050-02EN 3.2 Mounting (2) Frame The MR head bias of the HDD disk enclosure (DE) is zero. The mounting frame is connected to SG. Use M3 screw for the mounting screw and the screw length should satisfy the specification in Figure 3.3. The tightening torque must not exceed 3 kgcm. When attaching the HDD to the system frame, do not allow the system frame to touch parts (cover and base) other than parts to which the HDD is attached. (3) Limitation of side-mounting Do not use the center hole. For screw length, see Figure 3.3. Note) These dimensions are recommended values; if it is not possible to satisfy them, contact us. ScrewScrew Details of B Details of A 3.0 or less 3.0 or less Frame of system cabinetFrame of system cabinet BPCA A 2 2.52.5 2.5 2.5DE Side surface mountingBottom surface mounting Figure 3.3 Mounting frame structure C141-E050-02EN Installation Conditions (4) Ambient temperature The temperature conditions for a disk drive mounted in a cabinet refer to the ambient temperature at a point 3 cm from the disk drive. The ambient temperature must satisfy the temperature conditions described in Section 1.4, and the airflow must be considered to prevent the DE surface temperature from exceeding 60°C. Provide air circulation in the cabinet such that the PCA side, in particular, receives sufficient cooling. To check the cooling efficiency, measure the surface temperatures of the DE. Regardless of the ambient temperature, this surface temperature must meet the standards listed in Table 3.1. Figure 3.4 shows the temperature measurement point. 1 Figure 3.4 Surface temperature measurement points (Sample: MHC2040AT) Table 3.1 Surface temperature measurement points and standard values No. Measurement point Temperature 1 DE cover 60°C max C141-E050-02EN 3.2 Mounting (5) Service area Figure 3.5 shows how the drive must be accessed (service areas) during and after installation. Mounting screw hole Cable connection Mounting screw hole Figure 3.5 Service area (Sample: MHC2040AT) (6) External magnetic fields Data corruption: Avoid mounting the disk drive near strong magnetic sources such as loud speakers. Ensure that the disk drive is not affected by external magnetic fields. C141-E050-02EN Installatio...
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