Engineering Design NIDisk Guia do Utilizador descarregar pdf (Página 21)

DartDisk User Guide

I/O Errors

Acquisition and playback errors arise when the I/O board cannot convert data, or when

DartDisk cannot cannot store or retrieve data from memory or the hard disk, at the requested

sample rate. DartDisk will issue the following message. Possible causes include performing

demanding processes in parallel with DartDisk, a slow CPU, or a slow hard disk. Remedies

are to terminate other processes, defragment the hard disk, increase CPU or disk capabilities,

or reduce sample rate. DartDisk may also fail if the progress window is moved on the

screen during I/O.

Note: DartDisk will save data acquired until the error, but use caution because final

data blocks may be corrupted.

Disk Fragmentation and Maximum Sample Rate

On older hard disks, fragmentation can degrade the maximum sample rate. Disks can be

defragmented by clicking My Computer | Files | Properties | Tools | Defragment Now in

Windows 95/98 or My Computer | Local Disk | Properties | Tools | Defragment Now in

Windows 2000/XP. This process should be performed with care.

Notebook Power Management

Some notebook computers (such Toshiba models) optionally reduce processor speed when

running from batteries, to conserve battery life. This can reduce the maximum achievable

sample rate. To avoid this, reconfigure the computer’s power management program (usually

available from the Control Panel) to run at full processor speed on battery power.

As an example, following are steps for reconfiguring a Toshiba Satellite 2250CDT: 1) run

Power Saver from the Control Panel (not the Windows-supplied Power Management utility),

2) in the "Running on batteries" section, set the power mode to High Power, 3) click Details,

select the Power Save Mode tab, and move the 4 slider controls associated with Processor

Speed to Full, 4) click OK.

Running the PCMCIA Card from a Desktop Computer

A PCMCIA card can be run from a desktop computer using a PCMCIA to PCI adapter card.

This card costs under $200 and can allow the card to do "double duty", for example, in a

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