NVM - Revision history

Ugrynks at 17:54, 14 October 2019

2019-10-14T17:54:17Z

← Older revision		Revision as of 20:54, 14 October 2019
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	'''Non-volatile memory (NVM''') or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled.		'''Non-volatile memory (NVM''') or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled.
	Non-volatile memory retains it~~'s state~~ even if the device is powered off. In other words, what's in non-volatile memory survives a device reboot. <br>		Non-volatile memory retains it states even if the device is powered off. In other words, what's in non-volatile memory survives a device reboot. <br>

	Basically there are two types of non-volatile memory. <br>		Basically there are two types of non-volatile memory. <br>
	The first one is ROM and the second one is Flash-RAM.<br>		The first one is ROM and the second one is Flash-RAM.<br>

	Most of you know this memory type by ~~it's~~ PC name, ROM. ROM stands for Read Only Memory and it is usually based on a flash memory.<br>		Most of you know this memory type by its PC name, ROM. ROM stands for Read-Only Memory and it is usually based on a flash memory.<br>
	What does ~~it mean~~ flash memory? ~~simple~~. That means we can re-program this memory to hold new data.		What does flash memory mean? Simple. That means that we can re-program this memory to hold new data.
	So what data is stored in the Flash ROM? It usually stores the OS and some other application related parts that we do not want to be erased.<br>		So what data is stored in the Flash ROM? It usually stores the OS and some other application related parts that we do not want to be erased.<br>

	On smartphones some applications will see/show the ROM as the Z-drive. It can be viewed/read, but not written to. ~~And on~~ newer devices based on Symbian 9.1/S60 3rd Edition, access to specific directories (or "folders", if you prefer that term) is also protected from unprivileged applications.<br>		On smartphones, some applications will see/show the ROM as the Z-drive. It can be viewed/read, but not written to. On newer devices based on Symbian 9.1/S60 3rd Edition, access to specific directories (or "folders", if you prefer that term) is also protected from unprivileged applications.<br>

	(Note: There are also two different Flash ROM technologies in use these days; "NOR Flash" and "NAND Flash". A device can have one or the other, or both kinds. Without going into ~~details~~, the main ~~things~~ to remember about these is that programs on NOR Flash can be run/executed without first loading the executable file to RAM. Programs on NAND Flash must first be loaded into RAM before it runs. NAND Flash is cheaper, but then requires the device to have more RAM to accommodate that.)<br>		(Note: There are also two different Flash ROM technologies in use these days; "NOR Flash" and "NAND Flash". A device can have one or the other, or both kinds. Without going into detail, the main thing to remember about these is that programs on NOR Flash can be run/executed without first loading the executable file to RAM. Programs on NAND Flash must first be loaded into RAM before it runs. NAND Flash is cheaper, but then requires the device to have more RAM to accommodate that.)<br>

	The second kind of non-volatile memory can be called "Flash RAM" as it is still based on the same Flash memory technology, but it is also writable (hence "RAM", as opposed to "ROM). This kind of memory is characterized as "user [storage] memory", or sometimes "phone memory". This is visible as the C-drive.<br>		The second kind of non-volatile memory, can be called "Flash RAM" as it is still based on the same Flash memory technology, but it is also writable (hence "RAM", as opposed to "ROM). This kind of memory is characterized as "user [storage] memory", or sometimes "phone memory". This is visible as the C-drive.<br>

	The C-drive is initialized with files/data that the operating system needs for various purposes (anything that needs a writable storage location that survives powering off the device). This is also the memory where by default things such as contacts, messages or photos ~~are saved, when they~~ are saved to "phone memory". Same goes for software applications (games or whatever) and their data files, when they are also installed to "phone memory".		The C-drive is initialized with files/data that the operating system needs for various purposes (anything that needs a writable storage location that survives powering off the device). This is also the memory where by default things such as contacts, messages or photos are saved to "phone memory". Same goes for software applications (games or whatever) and their data files, when they are also installed to "phone memory".

Ugrynks at 14:15, 27 May 2019

2019-05-27T14:15:06Z

← Older revision		Revision as of 17:15, 27 May 2019
Line 1:		Line 1:
	'''Non-volatile memory (NVM''') or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled.		'''Non-volatile memory (NVM''') or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled.
	Non-volatile memory retains it's state even if the device is powered off. In other words, what's in non-volatile memory survives a device reboot.		Non-volatile memory retains it's state even if the device is powered off. In other words, what's in non-volatile memory survives a device reboot. <br>
	~~Basically there are two types of non-volatile memory. The first one is ROM and the second one is Flash-RAM.~~
	Most of you know this memory type by it's PC name, ROM. ROM stands for Read Only Memory and it is usually based on a flash memory. what does it mean flash memory? simple. That means we can re-program this memory to hold new data.
	~~So what data is stored in the Flash ROM? it usually stores the OS and some other application related parts that we do not want to be erased.~~

	~~On smartphones some applications will see/show the~~ ROM as the Z-drive. It can be viewed/read, but not written to. And on newer devices based on Symbian 9.1/S60 3rd Edition, access to specific directories (or "folders", if you prefer that term) is also protected from unprivileged applications.		Basically there are two types of non-volatile memory. <br>
			The first one is ROM and the second one is Flash-RAM.<br>

	~~(Note: There are also two different Flash~~ ROM ~~technologies in use these days; "NOR Flash"~~ and ~~"NAND Flash"~~. ~~A device~~ can ~~have one or the other, or both kinds~~. ~~Without going into details,~~ the ~~main things to remember about these is that programs on NOR~~ Flash ~~can be run/executed without first loading~~ the ~~executable file~~ to ~~RAM. Programs on NAND Flash must first~~ be ~~loaded into RAM before it runs. NAND Flash is cheaper, but then requires the device to have more RAM to accomodate that~~.)		Most of you know this memory type by it's PC name, ROM. ROM stands for Read Only Memory and it is usually based on a flash memory.<br>
			What does it mean flash memory? simple. That means we can re-program this memory to hold new data.
			So what data is stored in the Flash ROM? It usually stores the OS and some other application related parts that we do not want to be erased.<br>

	The second kind of non-volatile memory can be called "Flash RAM" as it is still based on the same Flash memory technology, but it is also writable (hence "RAM", as opposed to "ROM). This kind of memory is characterized as "user [storage] memory", or sometimes "phone memory". This is visible as the C-drive.		On smartphones some applications will see/show the ROM as the Z-drive. It can be viewed/read, but not written to. And on newer devices based on Symbian 9.1/S60 3rd Edition, access to specific directories (or "folders", if you prefer that term) is also protected from unprivileged applications.<br>

			(Note: There are also two different Flash ROM technologies in use these days; "NOR Flash" and "NAND Flash". A device can have one or the other, or both kinds. Without going into details, the main things to remember about these is that programs on NOR Flash can be run/executed without first loading the executable file to RAM. Programs on NAND Flash must first be loaded into RAM before it runs. NAND Flash is cheaper, but then requires the device to have more RAM to accommodate that.)<br>

			The second kind of non-volatile memory can be called "Flash RAM" as it is still based on the same Flash memory technology, but it is also writable (hence "RAM", as opposed to "ROM). This kind of memory is characterized as "user [storage] memory", or sometimes "phone memory". This is visible as the C-drive.<br>

	The C-drive is initialized with files/data that the operating system needs for various purposes (anything that needs a writable storage location that survives powering off the device). This is also the memory where by default things such as contacts, messages or photos are saved, when they are saved to "phone memory". Same goes for software applications (games or whatever) and their data files, when they are also installed to "phone memory".		The C-drive is initialized with files/data that the operating system needs for various purposes (anything that needs a writable storage location that survives powering off the device). This is also the memory where by default things such as contacts, messages or photos are saved, when they are saved to "phone memory". Same goes for software applications (games or whatever) and their data files, when they are also installed to "phone memory".

	~~Another writable storage solution that is also based on Flash memory technology, are the memory cards.~~

Ugrynks: Created page with "'''Non-volatile memory (NVM''') or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled. Non-volatile mem..."

2019-05-27T14:08:14Z

Created page with "'''Non-volatile memory (NVM''') or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled. Non-volatile mem..."

New page

'''Non-volatile memory (NVM''') or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled.
Non-volatile memory retains it's state even if the device is powered off. In other words, what's in non-volatile memory survives a device reboot.
Basically there are two types of non-volatile memory. The first one is ROM and the second one is Flash-RAM.
Most of you know this memory type by it's PC name, ROM. ROM stands for Read Only Memory and it is usually based on a flash memory. what does it mean flash memory? simple. That means we can re-program this memory to hold new data.
So what data is stored in the Flash ROM? it usually stores the OS and some other application related parts that we do not want to be erased.

On smartphones some applications will see/show the ROM as the Z-drive. It can be viewed/read, but not written to. And on newer devices based on Symbian 9.1/S60 3rd Edition, access to specific directories (or "folders", if you prefer that term) is also protected from unprivileged applications.

(Note: There are also two different Flash ROM technologies in use these days; "NOR Flash" and "NAND Flash". A device can have one or the other, or both kinds. Without going into details, the main things to remember about these is that programs on NOR Flash can be run/executed without first loading the executable file to RAM. Programs on NAND Flash must first be loaded into RAM before it runs. NAND Flash is cheaper, but then requires the device to have more RAM to accomodate that.)

The second kind of non-volatile memory can be called "Flash RAM" as it is still based on the same Flash memory technology, but it is also writable (hence "RAM", as opposed to "ROM). This kind of memory is characterized as "user [storage] memory", or sometimes "phone memory". This is visible as the C-drive.

The C-drive is initialized with files/data that the operating system needs for various purposes (anything that needs a writable storage location that survives powering off the device). This is also the memory where by default things such as contacts, messages or photos are saved, when they are saved to "phone memory". Same goes for software applications (games or whatever) and their data files, when they are also installed to "phone memory".

Another writable storage solution that is also based on Flash memory technology, are the memory cards.