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Fiber Optic Wiki

Compact Flash interface

August 2, 2011

Compact flash is just a miniature ATA interface, slightly modified to be able to also supply power to the CF device.

External parallel ATA devices

August 2, 2011

It is extremely uncommon to find external PATA devices that directly use the interface for connection to a computer. PATA is primarily restricted to devices installed internally, due to the short data cable specification. A device connected externally needs additional cable length to form a U-shaped bend so that the external device may be placed alongside, or on top of the computer case, and the standard cable length is too short to permit this.

HDD passwords and security

August 2, 2011

The disk lock is a built-in security feature in the disk. It is part of the ATA specification, and thus not specific to any brand or device. The disk lock can be enabled and disabled by sending special ATA commands to the drive. If a disk is locked, it will refuse all access until it is unlocked.

"One operation at a time"

August 2, 2011

This is caused by the omission of both overlapped and queued feature sets from most parallel ATA products. Only one device on a cable can perform a read or write operation at one time, therefore a fast device on the same cable as a slow device under heavy use will find it has to wait for the slow device to complete its task first.

Identification and Addressing of SAS Domain

August 1, 2011

A SAS Domain is the SAS version of a SCSI domain — it consists of a set of SAS devices that communicate with one another by means of a service delivery subsystem. Each SAS port in a SAS domain has a SCSI port identifier that identifies the port uniquely within the SAS domain. It is assigned by the device manufacturer, like an Ethernet device's MAC address, and is typically world-wide unique as well. SAS devices use these port identifiers to address communications to each other.

Serial Attached SCSI system

August 1, 2011

A typical Serial Attached SCSI system consists of the following basic components:

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