Build A Lot 4 Power Source Serial Number [UPDATED]
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Windows If your drive is connected to your computer: Seagate has created a very simple tool that will tell you the serial number and the model number of any and all Seagate, Samsung and Maxtor-brand drives connected in or to your computer. Use the DriveDetect.exe method to find both numbers.
If your drive is not detected or connected to your computer: The USB devices have the serial numbers printed on the external cases and internal drives have the serial and part numbers on the drive labels.
In the 1900 date system, the first day that is supported is January 1, 1900. When you enter a date, the date is converted into a serial number that represents the number of elapsed days starting with 1 for January 1, 1900. For example, if you enter July 5, 1998, Excel converts the date to the serial number 35981.
In the 1904 date system, the first day that is supported is January 1, 1904. When you enter a date, the date is converted into a serial number that represents the number of elapsed days since January 1, 1904, starting with 0 for January 1, 1904. For example, if you enter July 5, 1998, Excel converts the date to the serial number 34519.
Because the two date systems use different starting days, the same date is represented by different serial numbers in each date system. For example, July 5, 1998 can have two different serial numbers, as follows.
The difference between the two date systems is 1,462 days; that is, the serial number of a date in the 1900 Date System is always 1,462 days bigger than the serial number of the same date in the 1904 date system. 1,462 days is equal to four years and one day (including one leap day).
In order to support unique TFTP boot directories for each Raspberry Pi the bootloader prefixes the filenames with a device specific directory. If neither start4.elf nor start.elf are found in the prefixed directory then the prefix is cleared.On earlier models the serial number is used as the prefix, however, on Raspberry Pi 4 the MAC address is no longer generated from the serial number making it difficult to automatically create tftpboot directories on the server by inspecting DHCPDISCOVER packets. To support this the TFTP_PREFIX may be customized to either be the MAC address, a fixed value or the serial number (default).
In earlier releases the client GUID (Option97) was just the serial number repeated 4 times. By default, the new GUID format isthe concatenation of the fourcc for RPi4 (0x34695052 - little endian), the board revision (e.g. 0x00c03111) (4-bytes), the least significant 4 bytes of the mac address and the 4-byte serial number.This is intended to be unique but also provide structured information to the DHCP server, allowing Raspberry Pi 4 computers to be identified without relying upon the Ethernet MAC OUID.
This option may be set to 0 to block self-update without requiring the EEPROM configuration to be updated. This is sometimes useful when updating multiple Raspberry Pis via network boot because this option can be controlled per Raspberry Pi (e.g. via a serial number filter in config.txt).
From this point the bootcode.bin code continues to load the system. The first file it will try to access is [serial_number]/start.elf. If this does not result in an error then any other files to be read will be pre-pended with the serial_number. This is useful because it enables you to create separate directories with separate start.elf / kernels for your Raspberry Pis.To get the serial number for the device you can either try this boot mode and see what file is accessed using tcpdump / wireshark, or you can run a standard Raspberry Pi OS SD card and cat /proc/cpuinfo.
The above uses the mailbox property interface GET_BOARD_SERIAL with a request size of 8 bytes and response size of 8 bytes (sending two integers for the request 0, 0). The response to this will be two integers (0x00000020 and 0x80000000) followed by the tag code, the request length, the response length (with the 31st bit set to indicate th