western digital
DESCRIPTION
Western Digital. March 2010. CE CY2010 Roadmap. Interface speed UDMA 100 or higher Power On Hours 2-10 hours per day Writes/read per day 1GB write / 2 GB read Transfer Type random with very narrow seek Profile Transfer per command >80% = 1 to 256 blocksTRANSCRIPT
Western DigitalWestern Digital
March 2010March 2010
Page 2
CE CY2010 Roadmap
WD Confidential 3
CE vs. PC
Interface Speed
PIO 4, UDMA 33 or 66
Power On Hours
24 hours / 7 days
Writes/Read per day
100GB W/ 15GB read (Dual tuner-SD)
Transfer Type
Random/ping pong across whole disk
Transfer length per command
10%= 1 to 20 blocks
90% = 256 to 4K blocks
Seek Activity
>5-30 I/O per second
Read/Write ratio
Write75% and Read 25%
Error time limit
Less than 250ms-1s
Temperature
45-70C
Interface speed
UDMA 100 or higher
Power On Hours
2-10 hours per day
Writes/read per day
1GB write / 2 GB read
Transfer Type
random with very narrow seek Profile
Transfer per command
>80% = 1 to 256 blocks
<20% = 240 to 256 blocks
Seek Activity
20-30 I/O’s per second
Read/Write ratio
70% Reads and 30% Write
Error time Limit
30 Seconds
Temperature
25-45C
DVR System PC System
Video Resolution Impact on StorageVideo Resolution Impact on Storage
SD resolution in MPEG-2/4~1 GB/Hour = ~2.28 Mbit/sec
HD resolution in MPEG-4~4 GB/Hour = ~9.1 Mbit/sec
WD Confidential
Surveillance Video ApplicationSurveillance Video Application
SVR
Cameras (1-16)
MPEG-4Encoder
HDD(s)
Designed for Security VideoDesigned for Security Video
3 Streams of SD MPEG-2 = 6.8 Mbit/sec or 3 Streams of HD MPEG-4 = 27.3 Mbit/sec = <10% R/W duty cycle
3 Streams of SD MPEG-2 = 6.8 Mbit/sec or 3 Streams of HD MPEG-4 = 27.3 Mbit/sec = <10% R/W duty cycle
4-16 Cameras into MPEG-2/4 encoder4-16 Streams of SD MPEG-2 = 9.1-36.4 Mbit/sec = ~10% R/W duty cycle
WD Confidential
Why use WD AV drives? Why use WD AV drives?
Proven best in class reliability Ramp load WarrantyWeek.com
Exceptionally cool WD GP drive has only a 7 Degree ambient to base casting temperature
delta Competitor 1 1TB drive runs 13 degrees hotter than WD GP Competitor 2 1TB drives runs 9 Degrees hotter than WD GP
– Source = Tom’s Hardware
Exceptionally low power Intelli-seek
Exceptionally quiet