Even so, if the standby consumption is not permissible, the system has a MOSFET which controls the NVRAM supply.
In the absence of power supply, the M48T129V has 10 years of data retention for the NVRAM and the date provided by the RTC.
This circuit has a power supply of 5 V provided by the USB connector and it is only used when a PC is connected for the programming of the microcontroller firmware or the transfer of the samples acquired and stored in the NVRAM.
Using the throughput numbers measured with the faster disks, this level of performance can be achieved with 108
NVRAM nodes, or about 137 nodes without
NVRAM.
Such a methodology would provide enterprise-class reliability without NVRAM and would deliver near-wire-speed write performance within existing ATA rotational speed frameworks.
www.sr5tech.com Serial ATA Characteristics Narrower Cabling Supports Lower Power Requirements Lower Pin Counts 10-year Roadmap Higher Performance Improved Connectivity (No Master-Slave) Longer Cabling PC Economies of Scale RAID-5 Performance Limitations Multiple I/Os in Read-Modify-Write Parity Calculation Overhead Fixed Stripe Size RAID Group Initialization RAID Group Rebuilding Table 3 ATA RAID-5 Reliability Penalties Platform requires write-back-caching Data loss on power failure Data out-of-sequence failure Parity recalculation failure File system corruption NVRAM is not an economic answer Single drive failure problem