27. January 2009 by Myke.

So you know that your hard drive will die sooner or later, but how do you proactively figure that out?  Magic 8-ball used to be the best method but as of recently we can do a much better job.

The standard IDE/SATA hard drive today is still the most mechanical piece of equipment sitting in your present day PC. And this will continue to be the case until solid state drives become much cheaper and much more compatible for present day hardware. The most unfortunate part of the problems with these drives, is how incredibly critical they are to the state of your computer. A hard drive failure means a dead computer - unless you are lucky enough to be running in some type of RAID environment, which most home users won’t be.

So those of us here at Homerun decided maybe we should put together a list of tools to help everyone else out that would like a better Magic 8-ball.  Below you will see our four choices and a brief description of the tool.  One thing to remember, these are Windows based tools and they are to be used at YOUR own risk, not ours. 
Crystal Disk Info

CrystalDiskInfo is a S.M.A.R.T. based utility that supports not only internal drives, but both USB and IEEE1394’s as well. It displays an incredible amount of simple and advanced disk information, and may always be running in the background. This includes temperature readings, read/write errors and power management tools, running at all times of the day.

General Drive Info

Advanced Diag of your drive

 HD Tune

HD Tune is a much simpler hard drive disk scanning utility that has benchmarking, advanced diagnostics, similar to Crystal and a disk scanning utility, very similar to the Windows version, but can be run in real-time. It also includes real-time temperature monitoring.

Benchmarking

Disk Scanning

HDD Health

HDD Health is another similar product. It includes temperature and real-time monitoring, but includes a health indicator, simply by percentage and nothing more. It does include the same advanced diagnostic tools as the other SMART utilities as well.

General Information

Extended Drive Information

HDD Scan

HDD Scan not only includes many SMART diagnostic utilities, but other disk utilities as well. It includes many advanced testing modes, such as reading, writing and erasing in linear. In comparison to the other products, HDD Scan might get you more bang for the free buck.

Various HDD Scan Tools

Available Surface Tests

Manufacturer Specific Products

Some people might trust products designated for their specific hard drive more then any other. So I’ve provided a list of all the major manufacturers with a link to their diagnostic tools. A few of these may even support different manufacturers.

Fujitsu - Supports all forms of internal connection and is capable of doing in depth surface and diagnostic testing.

Hitachi - Several diagnostic tools for Hitachi drives. Analyze, optimize and protect your drive from failure.

Samsung- The Samsung utility will only work with Samsung drives and is an offline bootable disk that can be run no matter what the state of your drive.

Seagate/Maxtor- The Seagate tools, also known as Seatools, are Windows specific tools that can quickly and comprehensively determine the state of your present Seagate or Maxtor hard drive.

Western Digital - In order to determine your appropriate tools, you’ll first have to select your specific product and browse to a compatible ‘Data Lifeguard Diagnostic Tools’. Thorough test and repair utilities for West Digital drives.

All of the tools above may or may not be able to resolve serious disk errors on your drive. But if you are worrisome about the state of your current HDD and you’d like to confirm it, these tools will help to do so. It will force you to begin transferring data, or backing up your data on a regular basis before the inevitable happens. Play with each of tools, and find the best that suits your situation.

Posted in Microsoft, General Hardware, Desktops, Laptops, Backups, Servers, Storage | No Comments »

27. January 2009 by Myke.

IPv4 is the fourth revision in the long development of IP and it is actually the first to be widely deployed.  Combined with IPv6, it is the core of inter-networking methods of the Internet.  IPv4 is to this day the most widely deployed Internet Layer protocol.

IPv4 uses 32-bit (four-byte) addresses, which limits the address space to 4,294,967,296 (2³²) possible unique addresses. However, some are reserved for special purposes such as private networks (~18 million addresses) or multi-cast addresses (~16 million addresses). This reduces the number of addresses that can be allocated as public Internet addresses. As the number of addresses available are consumed, an IPv4 address shortage appears to be inevitable, however network address translation (NAT) has significantly delayed this inevitability.

This limitation has helped stimulate the push towards IPv6, which is currently in the early stages of deployment and is currently the only contender to replace IPv4.

IPv6 is the next generation Internet Layer protocol for inter-networks and the Internet.  In December 2008, despite celebrating its 10-year anniversary as a Standards Track protocol, IPv6 was only in its infancy in terms of general world-wide deployment. A recent study by Google indicates that penetration is still less than one percent of Internet traffic in any country. The leaders are Russia (0.76%), France (0.65%), Ukraine (0.64%), Norway (0.49%), and the United States (0.45%). Although Asia leads in terms of absolute deployment numbers, the relative penetration is smaller (e.g., China: 0.24%). IPv6 is implemented on all major operating systems in use in commercial, business, and home consumer environments. According to the study, Mac OS leads in IPv6 penetration of 2.44%, followed by Linux (0.93%) and Windows Vista (0.32%).

The length of network addresses emphasize a most important change when moving from IPv4 to IPv6. IPv6 addresses are 128 bits long (as defined by RFC 4291), whereas IPv4 addresses are 32 bits; where the IPv4 address space contains roughly 4 billion addresses, IPv6 has enough room for 3.4×10³⁸ unique addresses.

IPv6 addresses are typically composed of two logical parts: a 64-bit (sub-)network prefix, and a 64-bit host part, which is either automatically generated from the interface’s MAC address or assigned sequentially. Because the globally unique MAC addresses offer an opportunity to track user equipment, and so users, across time and IPv6 address changes, RFC 3041 was developed to reduce the prospect of user identity being permanently tied to an IPv6 address, thus restoring some of the possibilities of anonymity existing at IPv4. RFC 3041 specifies a mechanism by which time-varying random bit strings can be used as interface circuit identifiers, replacing unchanging and traceable MAC addresses.

So this brings us to the differences between IPv4 and IPv6:

1. Simplified header format. IPv6 has a fixed length header, which does not include most of the options an IPv4 header can include. Even though the IPv6 header contains two 128 bit addresses (source and destination IP address) the whole header has a fixed length of 40 bytes only. This allows for faster processing.
   Options are dealt with in extension headers, which are only inserted after the IPv6 header if needed. So for instance if a packet needs to be fragmented, the fragmentation header is inserted after the IPv6 header. The basic set of extension headers is defined in RFC 2460.
2. Address extended to 128 bits. This allows for hierarchical structure of the address space and provides enough addresses for almost every ‘grain of sand’ on the earth. Important for security and new services/devices that will need multiple IP addresses and/or permanent connectivity.
3. A lot of the new IPv6 functionality is built into ICMPv6 such as Neighbor Discovery, Autoconfiguration, Multi-cast Listener Discovery, Path MTU Discovery.
4. Enhanced Security and QoS Features.

posted by: Myke Reinhold
credit: Homerun-Networks, Google, Wikipedia

Posted in Internet, Networking, Security | No Comments »