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HardDrives.DOC
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1980-02-04
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Compatible Hard Disk Drives
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Any hard disk for use with the Personal Animation Recorder
must be IDE type. SCSI interfaces are not supported.
Manufacturer: Quantum Model: QTLC1080A
Capacity: 1080 Mbytes
Recommended Block Limit (NTSC): 254
Recommended Block Limit (PAL): 320
Manufacturer: Quantum Model: QTLC540A
Capacity: 540 Mbytes
Recommended Block Limit (NTSC): 254
Recommended Block Limit (PAL): 320
Manufacturer: Seagate Model: 3655A
Capacity: 540 Mbytes
Recommended Block Limit: 170
Manufacturer: Seagate Model: ST5660A
Capacity: 540 Mbytes
Recommended Block Limit: 200
Manufacturer: Seagate Model: ST31220A
Capacity: 1 Gbytes
Recommended Block Limit: 200
Manufacturer: Micropolis Model: 2205A
Capacity: 542 Mbytes
Recommended Block Limit: 240
Manufacturer: Micropolis Model: 2210A
Capacity: 976 Mbytes
Recommended Block Limit: 240
Manufacturer: Micropolis Model: 2217A
Capacity: 1.6 Gbytes
Recommended Block Limit: 240
Manufacturer: Conner Model: CFA540A
Capacity: 540 Mbytes
Recommended Block Limit: 200
Manufacturer: Conner Model: CFA1080A
Capacity: 1.0 Gbyte
Recommended Block Limit: 200
Manufacturer: Conner Model: CFA1275A
Capacity: 1.275 Gbyte
Recommended Block Limit: 240
Special Drive Notes:
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Micropolis 2200A series drives work
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Micropolis 2205A, 2210A and 2217A harddisks are now supported. The 2205A is
a 500 megabyte IDE drive, the 2210A is a one gigabyte IDE drive and the
2217A is a 1.6 gigabyte drive. These drives are 20% faster than the Seagate
models and have no thermal recal problems.
Using the Micropolis Drives with PAR
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Locate the jumper block labeled J6 on the component side of
the Micropolis drive. If only one drive is being installed,
J6 should not have any jumpers installed in the W1 and W2
positions. (The W1 position is the position furthest from
the power connector J3.) If two drives are being installed,
you will require a ribbon cable that supports this
configuration. (Any standard IDE interface cable,
available from most computer dealers will do) Follow
the procedure outlined in Chapter 1, for instructions on
installing this cable.On the drive intended to be the
master, remove jumper W2 and check that jumper W1 is
installed. On the drive intended to be the slave, check that
jumper W2 is installed and jumper W1 is removed. Install
the hard drive(s) into your computer according to the
instructions outlined in Chapter 1.Note: If a Micropolis
and Seagate drive are installed on the same PAR card,
both drives need to be set as master.
Conner CFA1275A drive supported
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The Conner CFA1275A is now supported. This drive now outpreforms the
Micropolis 2200A series drives.
Conner CFA540A & CFA1080A drives supported
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The Conner model CFA540A & CFA1080A harddisks are now supported.
These drives are just slightly slower than the Micropolis drives,
and also performs without any thermal recal problems.
Conner CFA540A, CFA1080A, CFA1275A.
--------------------------------------------------------------------------
Pins: Signal Description
1 and 2 C/D Open: Drive will act as slave.
Closed: Drive will act as master
3 and 4 A/C Open: Conner master/slave mode
Closed: ATA/CAM master slave mode
Seagate 3655A support
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Because the 3655A recalabrates every two minutes the longest segment of video
that can be played back is 120 seconds.
Using the Drives Efficiently
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The DPS Personal Animation Recorder software permits the adjustment of both
the block limit and the Q-Factor. The block limit represents the number of
512 byte blocks that comprise each animation frame. Increasing the block
limit increases the amount of data stored for each animation frame. This
improves the image quality at the expense of playback time. If too large a
block limit is specified, the disk drive will not be able to transfer the
required data in time and the animation playback will break up. By testing
a few frames of your animation at various block limit values, you can
establish the most appropriate block size for your needs. See above for
maximum block sizes for the supported drives. Smaller block sizes are
typically required when storing animations on the inner tracks of the hard
drive.
The Q factor is a relative measurement of image quality which is inversely
related to compression. The Q factor will automatically change as frames
are converted from IFF or Video Toaster Framestore files. The PAR hardware
performs a number of automatic tests during the file conversion process to
select the highest possible Q factor for a given block size and image
complexity. By watching this level you assure the maximum preformance of the
product.
When using a DPS Personal TBC IV card to perform realtime hard drive
recording, the Q factor and block limit values will differ from those used in
single frame recording. This is because the 30 Hz frame rate of realtime
recording provides insufficient time for the PAR hardware to automatically
scale the Q factor and perform filtering. Rather, one must manually set the
Q factor to a setting where the whole scene can be grabbed without
generating any error messages. Feel free to experiment with values yourself.
Also be sure to check the README file on all PAR software and upgrade disks for
other hints or late breaking news.