Interface

[signal]

[I/O]

[Description]

DMARQ

O

This signal is used for DMA transfer between the host system and

 

 

the device. The device asserts this signal when the device

 

 

completes the preparation of DMA data transfer to the host system

 

 

(at reading) or from the host system (at writing).

 

 

The direction of data transfer is controlled by the DIOR and

 

 

DIOW signals. This signal hand shakes with the DMACK-signal.

 

 

In other words, the device negates the DMARQ signal after the

 

 

host system asserts the DMACK signal. When there is other data

 

 

to be transferred, the device asserts the DMARQ signal again.

 

 

When the DMA data transfer is performed, IOCS16-, CS0- and

 

 

CS1- signals are not asserted. The DMA data transfer is a 16-bit

 

 

data transfer.

+5 VDC

I

+5 VDC power supplying to the device.

GND

-

Grounded signal at each signal wire.

Note:

“I” indicates input signal from the host to the device.

“O” indicates output signal from the device to the host.

“I/O” indicates common output or bi-directional signal between the host and the device.

5.2 Logical Interface

The device can operate for command execution in either address-specified mode; cylinder-head-sector (CHS) or Logical block address (LBA) mode. The IDENTIFY DEVICE information indicates whether the device supports the LBA mode. When the host system specifies the LBA mode by setting bit 6 in the Device/Head register to 1, HS3 to HS0 bits of the Device/Head register indicates the head No. under the LBA mode, and all bits of the Cylinder High, Cylinder Low, and Sector Number registers are LBA bits.

The sector No. under the LBA mode proceeds in the ascending order with the start point of LBA0 (defined as follows).

LBA0 = [Cylinder 0, Head 0, Sector 1]

Even if the host system changes the assignment of the CHS mode by the INITIALIZE DEVICE PARAMETER command, the sector LBA address is not changed.

LBA = [((Cylinder No.) × (Number of head) + (Head No.)) × (Number of sector/track)] + (Sector No.) − 1

5-6

C141-E050-02EN

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Fujitsu MHD2021AT, MHC2032AT, MHC2040AT, MHD2032AT manual Logical Interface, Dmarq
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MHC2040AT, MHC2032AT, MHD2032AT, MHD2021AT specifications

Fujitsu offers a range of advanced hard disk drives (HDD) designed for various computing needs, including the MHD2021AT, MHD2032AT, MHC2032AT, and MHC2040AT models. These drives combine reliable performance, capacity options, and technological features aimed at enhancing data storage efficiency.

The Fujitsu MHD2021AT is known for its capacity of 20 GB, making it an excellent choice for users requiring a compact and efficient HDD. With a spindle speed of 5400 RPM, it balances speed and power consumption, catering to mobile computing and lower power devices. Its ATA interface ensures compatibility with a wide range of systems, making it a versatile option for various applications.

The MHD2032AT model offers a slightly higher capacity of 30 GB, maintaining similar technological attributes to its predecessor. With an enhanced data transfer rate, it allows for quicker access to stored files, perfect for users handling larger volumes of data. The robust error correction features in this model further ensure data integrity, making it a reliable choice for demanding environments.

For users needing more robust storage solutions, the MHC2032AT steps it up with features tailored for performance-heavy applications. Its 30 GB capacity is suited for desktop and workstation environments that require swift data retrieval and significant storage. The drive employs advanced caching techniques, which boost performance further by optimizing read and write operations, ensuring smoother multitasking capabilities.

The MHC2040AT is the flagship model in this line, providing an impressive storage capacity of 40 GB. This HDD is designed for high-performance applications where speed is crucial. The drive’s increased spindle speed and superior data transfer rates make it ideal for video editing, gaming, and large database management. Alongside its enhanced performance features, it includes advanced thermal management technology that maintains optimal operational temperatures, prolonging the drive's lifespan.

All four models leverage Fujitsu's commitment to data reliability, featuring robust shock resistance and low noise levels. Collectively, these drives cater to a spectrum of user needs, from compact data storage to high-capacity solutions, maintaining Fujitsu's reputation for quality and innovation in the storage market.
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