Dell D24M, Service Manual

Page: 11 / 99

Figure 3. Curved edge
Memory Errors
Memory errors on the system display 2,3 failure code. If all memory fails, the LCD does not turn on. Troubleshoot for possible
memory failure by trying known good memory modules in the memory connectors on the bottom of the system or under the
keyboard, as in some portable systems.
NOTE: The DDR4 memory is imbedded in board and not a replaceable DIMM as shown and referred.
Intel Rapid Storage Technology (Intel RST)
The following article provides an overview of the Intel Rapid Storage Technology application and its features:
Overview
Intel Rapid Storage Technology (IRST) is a hardware, firmware and, software-based RAID solution. IRST was previously known
as Matrix RAID. IRST allows for creation of two RAID volumes on a single RAID array where both the volumes can be of the
same or different type.
NOTE: Precision 3640 Tower does not support discreet RAID option.
IRST encapsulates newer level of protection with better performance, and low power consumption. IRST user interface
simplifies creation and management of storage assets.
The fault tolerance is averted using one of the following RAID levels:
1. RAID 0 (Striping):
Multiple storage devices are combined to what appears to be a single virtual drive. Data is arranged as blocks that are spread
across multiple storage devices using process called striping. RAID 0 uses Read/ Write capabilities of two or more storage
devices in parallel, enhancing performance. There is no redundancy, hence if any of the storage devices fails, the RAID has to
be re-created.
2. RAID 1 (Mirroring):
Two storage devices are mirrored or duplicated to achieve redundancy and hence enhance reliability in an event of single
drive failure. The performance is that of a single drive.
Technology and components 11