![]() The path is /dev/mmcblk0p5 for the PR4100 NAS. Look for the device with an entry labeled wdnas_rescue_fw and note the device path. To determine which NAND flash partition contains the rescue firmware, execute the following command. To enable the rescue firmware functionality contained in the second GRUB menu entry, one must first copy the rescue firmware from the NAND flash partition using SSH. In my experience, small inexpensive USB flash drives tend to work best for booting purposes. In some cases there may be certain hardware incompatibilities which can cause it to fail to boot properly. If the NAS fails to boot from USB, try using a different USB flash drive. Loading the image.cfs file from the USB stick is possible, but knowledge of the firmware build process is required. However, the NAS firmware also requires a SquashFS file named image.cfs to load the primary root filesystem, which is currently loaded from NAND flash memory. ![]() The uImage file is the Linux kernel, and the uRamdisk file is the initial RAM filesystem.Īt this point, the first GRUB menu entry will be sufficient to boot a Linux kernel and initramfs for testing purposes. The startup.nsh file is a script, which automatically runs every time a bootloader shell environment is opened. The boot圆4.efi file is the GRUB bootloader, which is configured by the grub.cfg file. Do not copy the grub folder, only its contents. Search -no-floppy -set=root -label USB_RESCUEĪlpha_CRC32_Check /uImage-rescue /uRamdisk-rescueĬopy uImage, uRamdisk and the contents of the grub folder to the root of the USB stick as follows. Set kcmdline="acpi_enforce_resources=lax net.ifnames=0 console=ttyS0,115200n8" grub/EFI/BOOT/boot圆4.efiĮdit the grub.cfg file and replace its contents with the following. WDM圜loud_PR4100_GPL_v2.30.165_20170321/firmware/merge/uRamdiskĮxtract the contents of the grub.tgz file. The following instructions are based on the WD My Cloud PR4100 NAS firmware, but they may be applicable to other WD My Cloud models, possibly with minor variations applied as needed.įormat a USB stick using the Fat32 filesystem and change its volume label to USB_RESCUE.ĭownload a copy of the My Cloud PR4100 GPL Source Code and extract the following files. If copying/pasting a command, do not copy/paste the "# " portion of the example. This indicates a command prompt with root access. NOTE: BASIC LINUX SKILLS AND ROOT ACCESS VIA SSH ARE REQUIREDĮach of the Linux command examples shown below is preceeded with "# " (no quotes). WARNING: THE FOLLOWING PROCEDURES MAY VOID YOUR WARRANTY OR BRICK YOUR NAS - USE EXTREME CAUTION AT ALL TIMES No modifications to the NAS or its firmware are required. It is important to note that the description provided lacks specific details about the features, functions, and capabilities of the server.This guide will demonstrate how to boot the NAS from a USB stick for testing, diagnosis and recovery purposes. The My Cloud Pro PR4100 uses the Serial ATA III storage drive interface for efficient data transfer. In terms of compatibility, this server supports various Windows operating systems including Windows 10 Education, Windows 10 Enterprise, Windows 10 Home, Windows 10 Pro, Windows 7 Enterprise, Windows 7 Home Basic, Windows 7 Home Premium, Windows 7 Professional, Windows 7 Starter, Windows 7 Ultimate, Windows 8, and Windows 8.1. It also comes with an external power adapter. ![]() The server supports a maximum of four storage drives, all of which can be HDDs.įor easy and quick installation, the My Cloud Pro PR4100 includes a quick installation guide and a quick start guide. These drives have a capacity of 8000 GB each and a size of 3.5 inches. It comes with four storage drives already installed, which are of the HDD type. The Western Digital My Cloud Pro PR4100 is a server with a total installed storage capacity of 32 TB. ![]()
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