Knowledge

For the sake of convenience, users sometimes like to copy their working files into a USB drive. Instead of bringing their own laptop, they tend to bring their USB to a client’s office to print or show the workings to clients and others using available PCs. This could pose potential risk of exposure to virus infection especially if the PC you are using does not have an up-to-date antivirus application installed. As today’s viruses are crafted to perfection and have evolved to become more sophisticated, the damage to files stored in your pen drive and even the infection to your laptop later could be substantially catastrophic. To avoid this unnecessary headache, of course you can choose to install antivirus application to your USB drive for security protection. Alternately, you could write protect your USB drive as the ideal solution.

Most USB drives have a small write-protect switch or slider like what you used to find in floppy disks which can be used to lock the drive as read only. If your USB drive doesn’t have one, to write protect or disable write access to the removable USB drive, you can try the registry hack of WriteProtect in StorageDevicePolicies registry key. If editing registry files is something you will only do last, perhaps some of the applications below could help you.

ThumbScrew
Thumbscrew is a free application which allows users to write protect their USB drive. Once it is installed, users just need to right click the System Tray icon and choose “Make USB Read Only” to activate the write protect.

USB Write Protector
Similar to ThumbScrew, USB Write protector is another free utility to write protect your USB drive. This utility is tiny in size and you can carry it along with you in your removable USB drive. USB Write protector can be downloaded via the link here.

With these applications above, you can easily write protect your USB pen drive from being accessed through the system. If you happen to come across better applications to write protect USB flash drive, feel free to share with us.

What More:

By enabling the write protection Your Peresonal computer becomes personal agaon as it doesn't allow any external source to write in Through any Usb external device like falsh disk or even a usb Dvd Rom.

By disabling you can make any usb drive writable. Sometimes it gets write protected automatically soooo here is the solution.

Symbian :

Symbian Ltd. is a software development and licensing company that produces Symbian OS, a smartphone operating system.

It was established in June 1998 and is headquartered in Southwark in the UK, and the current CEO is Nigel Clifford.

On 24 June 2008, Nokia announced it would acquire Symbian Ltd. in full and the acquisition was completed on 2nd December 2008.

Symbian OS

Symbian develops and licenses Symbian OS, an operating system for advanced 2.5G and 3G mobile phones. User interface layers are provided by third parties. These include Series 60 and Series 80 by Nokia, UIQ from UIQ Technology and MOAP for NTT DoCoMo.

Handset You Use And About It's OS

PLEASE SEARCH WITH YOUR PHONE"S MODEL NUMBER RATHER THAN SCROLLING UP AND DOWN

EPOC

Osaris PDA by Oregon Scientific with EPOC operating system

EPOC is a family of graphical operating systems developed by Psion for portable devices, primarily PDAs. EPOC came from epoch, the beginning of an era, but was backfitted by the engineers to "Electronic Piece Of Cheese".

EPOC16

EPOC16, originally simply named EPOC, is the operating system developed by Psion in the late 1980s and early 1990s for Psion's "SIBO" (SIxteen Bit Organisers) devices. All EPOC16 devices feature an 8086-family processor and a 16-bit architecture. EPOC16 is a single-user pre-emptive multitasking operating system, written in Intel 8086 assembler language and C and designed to be delivered in ROM. It supported a simple programming language called OPL and an IDE called OVAL. SIBO devices include the: MC200, MC400, Series 3 (1991-1998), Series 3a, Series 3c, Series 3mx, Siena, Workabout and Workabout mx. The MC400 and MC200, the first EPOC16 devices, shipped in 1989, and as of September 2007^[update], the Workabout mx is still in production.

EPOC16 features a primarily 1-bit, keyboard-operated graphical interface (the hardware for which it was designed did not have pointer input).

In the late 1990s the operating system was referred to as EPOC16 to distinguish it from Psion's new EPOC32 OS.

EPOC32

The first version of EPOC32, Release 1 appeared on the Psion Series 5 ROM v1.0 in 1997. Later, ROM v1.1 featured Release 3 (Release 2 was never publicly available.) These were followed by the Psion Series 5mx, Revo / Revo plus, Psion Series 7 / netBook and netPad (which all featured Release 5).

The EPOC32 operating system, at the time simply referred to as EPOC, was later renamed Symbian OS. Adding to the confusion with names, before the change to Symbian, EPOC16 was often referred to as SIBO to distinguish it from the "new" EPOC. Despite the similarity of the names, EPOC32 and EPOC16 were completely different operating systems, EPOC32 being written in C++ from a new codebase with development beginning during the mid 1990s.

EPOC32 is a pre-emptive multitasking, single user operating system with memory protection, which encourages the application developer to separate their program into an engine and an interface. The Psion line of PDAs come with a graphical user interface called EIKON which is specifically tailored for handheld machines with a keyboard (thus looking perhaps more similar to desktop GUIs than palmtop GUIs [2]). However, one of EPOC's characteristics is the ease with which new GUIs can be developed based on a core set of GUI classes, a feature which has been widely explored from Ericsson R380 and onwards.

EPOC32 was originally developed for the ARM family of processors, including the ARM7, ARM9, StrongARM and Intel's XScale, but can be compiled towards target devices using several other processor types.

During the development of EPOC32, Psion planned to license EPOC to third-party device manufacturers, and spin off its software division as Psion Software. One of the first licensees was the short-lived Geofox, which halted production with less than 1,000 units sold. Ericsson marketed a rebranded Psion Series 5mx called the MC218, and later created the EPOC Release 5.1 based smartphone, the R380. Oregon Scientific also released a budget EPOC device, the Osaris (notable as the only EPOC device to ship with Release 4).

In June 1998, Psion Software became Symbian, a major joint venture between Psion and phone manufacturers Ericsson, Motorola, and Nokia. As of Release 6, EPOC became known simply as Symbian OS.

EPOC OS Releases 1–3

Work started on the 32-bit version in late 1994. The Series 5 device, released in June 1997, used the first iterations of the EPOC32 OS, codenamed "Protea", and the "Eikon" graphical user interface.

EPOC Release 4

Oregon Scientific Osaris

EPOC Release 5

The Psion Series 5mx, Psion Series 7, Psion Revo, Diamond Mako, Psion netBook, netPad, GeoFox One, and Ericsson MC218 were released in 1999 using ER5. A phone project was announced at CeBIT, the Phillips Illium/Accent, but did not achieve a commercial release. This release has been retrospectively dubbed Symbian OS 5; it was never called that at the time.

ER5u

The first phone, the Ericsson R380 was released using ER5u in November 2000. It was not an 'open' phone – software could not be installed. Notably, a number of never-released Psion prototypes for next generation PDAs, including a Bluetooth Revo successor codenamed Conan were using ER5u. The 'u' in the name refers to the fact that it supported Unicode.

Symbian OS v6.0 and 6.1

The OS was renamed Symbian OS and was envisioned as the base for a new range of smartphones. This release sometime is called ER6. Psion gave 130 key staff to the new company and retained a 31% shareholding in the spun-out business.

The first 'open' Symbian OS phone, the Nokia 9210 Communicator, was released in June 2001. Bluetooth support added. Almost 500,000 Symbian phones were shipped in 2001, rising to 2.1 million the following year.

Development of different UIs was made generic with a "reference design strategy" for either 'smartphone' or 'communicator' devices, subdivided further into keyboard- or tablet-based designs. Two reference UIs (DFRDs or Device Family Reference Designs) were shipped - Quartz and Crystal. The former was merged with Ericsson's 'Ronneby' design and became the basis for the UIQ interface, the latter reached the market as the Nokia Series 80 UI.

Later DFRDs were Sapphire, Ruby, and Emerald. Only Sapphire came to market, evolving into the Pearl DFRD and finally the Nokia Series 60 UI, a keypad-based 'square' UI for the first true smartphones. The first one of them was the Nokia 7650 smartphone (featuring Symbian OS 6.1), which was also the first with a built-in camera, with VGA (0.3 Mpx = 640*480) resolution.

Despite these efforts to be generic the UI was clearly split between competing companies, Crystal or Sapphire was Nokia, Quartz was Ericsson. DFRD was abandoned by Symbian in late 2002, as part of an active retreat from UI development in favour of 'headless' delivery. Pearl was given to Nokia, Quartz development was spun-off as UIQ Technology AB, and work with Japanese firms was quickly folded into the MOAP standard.

Symbian OS 7.0 and 7.0s

First shipped in 2003. This is an important Symbian release which appeared with all contemporary user interfaces including UIQ (Sony Ericsson P800, P900, P910, Motorola A925, A1000), Series 80 (Nokia 9300, 9500), Series 90 (Nokia 7710), Series 60 (Nokia 3230, 6260, 6600, 6670, 7610) as well as several FOMA phones in Japan. It also added EDGE support and IPv6. Java support was changed from pJava and JavaPhone to one based on the Java ME standard.

One million Symbian phones were shipped in Q1 2003, with the rate increasing to one million a month by the end of 2003.

Symbian OS 7.0s was a version of 7.0 special adapted to have greater backward compatibility with Symbian OS 6.x, partly for compatibility between the Communicator 9500 and its predecessor the Communicator 9210.

In 2004, Psion sold its stake in Symbian. The same year, the first worm for mobile phones using Symbian OS, Cabir, was developed, which used Bluetooth to spread itself to nearby phones. See Cabir and Symbian OS threats.

Symbian OS 8.0

First shipped in 2004, one of its advantages would have been a choice of two different kernels (EKA1 or EKA2). However, the EKA2 kernel version did not ship until Symbian OS 8.1b. The kernels behave more or less identically from user-side, but are internally very different. EKA1 was chosen by some manufacturers to maintain compatibility with old device drivers, while EKA2 was a real-time kernel. 8.0b was deproductized in 2003.

Also included were new APIs to support CDMA, 3G, two-way data streaming, DVB-H, and OpenGL ES with vector graphics and direct screen access.

Symbian OS 8.1

Basically a cleaned-up version of 8.0, this was available in 8.1a and 8.1b versions, with EKA1 and EKA2 kernels respectively. The 8.1b version, with EKA2's single-chip phone support but no additional security layer, was popular among Japanese phone companies desiring the real-time support but not allowing open application installation. The first and maybe the most famous smartphone featuring Symbian OS 8.1a was Nokia N90 in 2005, Nokia's first in Nseries. It comes with Carl-Zeiss Tessar optics and a 2 Mpx (1600*1200) camera with video capabilities to take VHS quality (352×288) videos and a huge screen resolution (at the time) of 352*416 pixels.

Symbian OS 9.0

This version was used for internal Symbian purposes only. It was de-productised in 2004. 9.0 marked the end of the road for EKA1. 8.1a is the final EKA1 version of Symbian OS.

Symbian OS has generally maintained reasonable binary code compatibility. In theory the OS was BC from ER1-ER5, then from 6.0 to 8.1b. Substantial changes were needed for 9.0, related to tools and security, but this should be a one-off event. The move from requiring ARMv4 to requiring ARMv5 did not break backwards compatibility.

A Symbian developer proclaims that porting from Symbian 8.x to Symbian 9.x is a more daunting process than Symbian says.

Symbian OS 9.1

Released early 2005. It includes many new security related features, particularly a controversial platform security module facilitating mandatory code signing. Symbian argues that applications and content, and therefore a developer's investment, are better protected than ever; however others contend that the requirement that every application be signed (and thus approved) violates the rights of the end-user, the owner of the phone, and limits the amount of free software available. The new ARM EABI binary model means developers need to retool and the security changes mean they may have to recode. S60 platform 3rd Edition phones have Symbian OS 9.1. Sony Ericsson is shipping the M600 and P990 based on Symbian OS 9.1. The earlier versions had a fatal defect where the phone hangs temporarily after the owner sent hundreds of SMS'es. However, on 13 September 2006, Nokia released a small program to fix this defect.

Support for Bluetooth 2.0 (was 1.2)

Symbian OS 9.2

Released Q1 2006. Support for OMA Device Management 1.2 (was 1.1.2). S60 3rd Edition Feature Pack 1 phones have Symbian OS 9.2. Nokia phones with Symbian OS 9.2 OS: Nokia E90, Nokia E66, Nokia E63, Nokia E71, Nokia E51, Nokia N95, Nokia N82, Nokia N81, Nokia 6290, Nokia 6120 classic, Nokia 5700.

Symbian OS 9.3

Released on 12 July 2006. Upgrades include improved memory management and native support for Wifi 802.11, HSDPA, Vietnamese language support. The Nokia N96 as well as the Nokia N78 feature Symbian OS 9.3. The Nokia N85 also runs on Symbian OS 9.3. As of Q2 2008, OS 9.3 has just entered new devices.

Symbian OS 9.4

Announced in March 2007. Provides the concept of demand paging which is available from v9.3 onwards. Applications should launch up to 75% faster. Additionally, SQL support is provided by SQLite. Ships with the Nokia 5800 XpressMusic.

Symbian OS 9.5

Includes native support for mobile digital television broadcasts in DVB-H and ISDB-T formats and also location services.

{Special thanks To Wikipedia, Miyaru and Other knowledge Sites For The Above info }

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In MY NExT POST WILL TELL ABOUT DIFFERENT COMPUTER OSs

Ahmedabad	Erode	Ludhiana	Thiruvananthapuram
Ajmer	Guntur	Mumbai	Tirupur
Bangalore	Hyderabad	Mysore	Udaipur
Bhopal	Indore	Nagpur	Ujjain
Chandigarh	Jaipur	Patiala	Vadodara
Chennai	Kakinda	Pune	Vapi
Coimbatore	Kolkata	Rajahmundry	Vijayvada
Delhi	Kota	Salem	Visakhapatnum
Ernakulam	Lucknow	Surat

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