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2048 GB Hard Disk
Is 2048GB Hard Disk same as 2TB Hard Disk? |
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2048 GB Hard Disk
Hard disk Size wrote:
Is 2048GB Hard Disk same as 2TB Hard Disk? There are two measurement systems inside computers. Disk drives are measured in power_of_ten units. The unit in this case, for the disk drive, would be "terabyte". The nearest equivalent units in the two systems, are explained in this article. So the 2TB drive has 2000000000000 bytes of storage. The disk drive manufacturers like this system, because it makes the drives "deceptively smaller". They wouldn't think of using power_of_two units to measure the total capacity, even though actual storage operations on the disk are done in power_of_two chunks. http://en.wikipedia.org/wiki/Tebibyte "1 tebibyte = 2**40 bytes = 1099511627776 bytes related to the terabyte, which is defined as --- disks 10**12 bytes = 1000000000000 bytes" The drive is not "naturally" that size. When you check the exact size, you'll find it's slightly more than the nice round number. If they were to give less than the number, they'd be in trouble with the FTC or equivalent organization. The disk drive uses "zoned" storage, meaning the tracks on the disk, don't store the same amount as you move across the disk. Since the diameter of each track differs, the information stored on the track can differ. And so there's no reason for the storage to really align with anything. It's just a big "bucket of bytes". But, at least the sectors are "power_of_two" units, whether they're 512 byte native sectors or 4096 byte native sectors. Both are power_of_two numbers. ******* Computer RAM uses binary addressing, and arrays of memory typically fill the address space, so the units in usage there are the power_of_two kind. So a 1GiB stick of RAM contains 1024*1024*1024 = 2**30 bytes. No rounding off to power_of_ten units there. http://en.wikipedia.org/wiki/Gibibyte "1 gibibyte = 2**30 bytes = 1073741824 bytes --- sticks of RAM related to the gigabyte, which is defined as 10**9 bytes = 1000000000 bytes" Having the addressing and dimensions work that way, makes design of the guts of the computer simpler. Address decoding is relatively simple, because of this choice of doing things. HTH, Paul |
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2048 GB Hard Disk
Hard disk Size wrote:
Is 2048GB Hard Disk same as 2TB Hard Disk? 2^10 = 1024 1 GB = 2^30 bytes 1 TB = 2^40 bytes = 2^10 * 2^30 = 1024 GB Decimal orders of magnitude: http://en.wikipedia.org/wiki/Kilobyte http://en.wikipedia.org/wiki/Megabyte http://en.wikipedia.org/wiki/Gigabyte http://en.wikipedia.org/wiki/Terabyte http://en.wikipedia.org/wiki/Petabyte Each has a handy table showing the various sizes. Each is 1000 (or 1024) times greater than the prior size. Because of the deliberate confusion caused by marketers trying to make hard disks look bigger than they are by using binary prefixes instead of decimal prefixes, new terms have evolved to differentiate those base on 2^N and 10^N. Binary orders of magnitude: http://en.wikipedia.org/wiki/Kibibyte http://en.wikipedia.org/wiki/Mebibyte http://en.wikipedia.org/wiki/Gibibyte http://en.wikipedia.org/wiki/Tebibyte http://en.wikipedia.org/wiki/Pebibyte Computers are binary. Marketers are decimal. |
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2048 GB Hard Disk
VanguardLH wrote:
Because of the deliberate confusion caused by marketers trying to make hard disks look bigger than they are by using binary prefixes instead of decimal prefixes, new terms have evolved to differentiate those base on 2^N and 10^N. Computers are binary. Marketers are decimal. Memory manufacturers and marketers use binary. Hard disc manufacturers and marketers use decimal except when reading/writing chunks from the discs, when they tend to use binary (but some SANs can use larger e.g. 520 up to 528 byte sectors, the total disc size doesn't vary though, the user just gets to use less of it.) |
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2048 GB Hard Disk
Hard disk Size wrote:
Is 2048GB Hard Disk same as 2TB Hard Disk? Yes. -- Crash "Something there is that doesn't love a wall, that wants it down." ~ Robert Frost ~ |
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2048 GB Hard Disk
Char Jackson wrote:
On Fri, 8 Jun 2012 23:53:11 -0400, wrote: On Sat, 09 Jun 2012 04:30:00 +0100, Hard disk Size wrote: Is 2048GB Hard Disk same as 2TB Hard Disk? In name only. In other words, yes. Is that what you meant? Consider yourself damn lucky if you wind up with 1600gb. I'm not sure why that would be lucky when you should end up with about 1853GB (or 1.81TB) after formatting. I have a 2TB internal drive, partitioned thus; 17GB 100GB 922.95GB 922.97GB = 1962.92GB in all. Taking 2048GB as the notional size, I get 1962.92/2048 *100 = 95.8457% Ed |
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2048 GB Hard Disk
In message , Ed Cryer
writes: Char Jackson wrote: On Fri, 8 Jun 2012 23:53:11 -0400, wrote: On Sat, 09 Jun 2012 04:30:00 +0100, Hard disk Size wrote: Is 2048GB Hard Disk same as 2TB Hard Disk? In name only. In other words, yes. Is that what you meant? Consider yourself damn lucky if you wind up with 1600gb. I'm not sure why that would be lucky when you should end up with about 1853GB (or 1.81TB) after formatting. I have a 2TB internal drive, partitioned thus; 17GB 100GB 922.95GB 922.97GB = 1962.92GB in all. Taking 2048GB as the notional size, I get 1962.92/2048 *100 = 95.8457% Ed I think the disc manufacturer would say 2000 is the notional size, in fact 2 000 000 000 bytes, so you're even closer to 100%. (I didn't _think_ formatting took that much; OK, you need a partition table. But the usual reason for discrepancy is the 2.4% difference between 1000 and 1024, raised to whatever power technology has reached, currently 3, making 1.073741824, i. e. about 7.4% difference between binary and decimal T, such that a 2 T drive is about 2/1.073741824 or ~1.86 TiB.) -- J. P. Gilliver. UMRA: 1960/1985 MB++G.5AL-IS-P--Ch++(p)Ar@T0H+Sh0!:`)DNAf "So, I take it you've ... been with a man before?" "I'm a virgin. I'm just not very good at it." Topper Harley & Ramada Thompson (Charlie Sheen & Valeria Golino), in "Hot Shots!" (1991). |
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2048 GB Hard Disk
On 09/06/2012 12:36, Ed Cryer wrote:
Char Jackson wrote: On Fri, 8 Jun 2012 23:53:11 -0400, wrote: On Sat, 09 Jun 2012 04:30:00 +0100, Hard disk Size wrote: Is 2048GB Hard Disk same as 2TB Hard Disk? In name only. In other words, yes. Is that what you meant? Consider yourself damn lucky if you wind up with 1600gb. I'm not sure why that would be lucky when you should end up with about 1853GB (or 1.81TB) after formatting. I have a 2TB internal drive, partitioned thus; 17GB 100GB 922.95GB 922.97GB = 1962.92GB in all. Taking 2048GB as the notional size, I get 1962.92/2048 *100 = 95.8457% The space available for data would be rather less than the partition sizes you give, as the Master File Table that windows uses is allocated 12% of the partition size by default, which can increase if you have a large number of small files in the volume. If you check a newly created, empty, unformatted, single partition on a 2TB Hard drive, you may see something not unadjacent to 95% of the HD size shown. When it is formatted as NTFS by Windows, you will immediately lose 12% of that for the MFT. If it is formatted for FAT32, then the FAT would normally be smaller than the MFT. -- Tciao for Now! John. |
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2048 GB Hard Disk
On Sat, 09 Jun 2012 04:30:00 +0100, Hard disk Size
wrote: Is 2048GB Hard Disk same as 2TB Hard Disk? Yes, exactly. They are two different ways of saying the same thing, just like seven days and a week. |
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2048 GB Hard Disk
On Sat, 09 Jun 2012 01:44:16 -0400, Paul wrote:
Hard disk Size wrote: Is 2048GB Hard Disk same as 2TB Hard Disk? There are two measurement systems inside computers. Sort of. Here's my standard post on the subject: All hard drive manufacturers define 1GB as 1,000,000,000 bytes, while the rest of the computer world, including Windows, defines it as 2 to the 30th power (1,073,741,824) bytes. So a 320 billion byte drive is actually around 300GB. Some people point out that the official international standard defines the "G" of GB as one billion, not 1,073,741,824. Correct though they are, using the binary value of GB is so well established in the computer world that I consider using the decimal value of a billion to be deceptive marketing on the part of the manufacturer. |
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2048 GB Hard Disk
On 08/06/2012 11:30 PM, Hard disk Size wrote:
Is 2048GB Hard Disk same as 2TB Hard Disk? I've read all the other comments. Allyou really need to know is: a) yes, 2048GB is 1TB, pretty close. b) the overhead" needed to keep track of files means that you get less than 2028 of available storage space. About 10% less. c) Windows doesn't release obsolete overhead space (data about files), so if you write and delete a lot of files, the actual available space will shrink. -- HTH, Wolf K. |
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2048 GB Hard Disk
"Dave \"Crash\" Dummy" wrote:
Hard disk Size wrote: Is 2048GB Hard Disk same as 2TB Hard Disk? Yes. First correct answer to a yes-or-no question! -- XS11E, Killing all posts from Google Groups The Usenet Improvement Project: http://twovoyagers.com/improve-usenet.org/ |
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2048 GB Hard Disk
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2048 GB Hard Disk
Ed Cryer wrote:
Char Jackson wrote: On Fri, 8 Jun 2012 23:53:11 -0400, wrote: On Sat, 09 Jun 2012 04:30:00 +0100, Hard disk Size wrote: Is 2048GB Hard Disk same as 2TB Hard Disk? In name only. In other words, yes. Is that what you meant? Consider yourself damn lucky if you wind up with 1600gb. I'm not sure why that would be lucky when you should end up with about 1853GB (or 1.81TB) after formatting. I have a 2TB internal drive, partitioned thus; 17GB 100GB 922.95GB 922.97GB = 1962.92GB in all. Taking 2048GB as the notional size, I get 1962.92/2048 *100 = 95.8457% Ed You can get size info from "dd". http://www.chrysocome.net/downloads/dd-0.5.zip ( syntax at http://www.chrysocome.net/dd ) Elevate a command prompt window (cmd.exe) then run dd --list and it will report the entire size of the disk (as visible to the OS, so can't "peer past" an HPA). It also gives sizes for each of the partitions. Partition0 is the entire disk, while Partition1-Partition4 could be the primary partitions. That should help clear up the notional size. My 500GB disk reports "NT Block Device Objects \\?\Device\Harddisk0\Partition0 size is 500,107,862,016 That is the amount of space that "dd" can access, which is why the tool outputs that data. You should not be able to access past that point (although the dd code fails to work right for USB flash sticks - that may have been fixed in a later version). If I use PTEDIT32 (which also needs to be elevated to work right), it gives information in CHS format. PTEDIT32 reports 60801 cylinders, 255 heads, 63 sectors, and that equals 60801*255*63*512 = 500,105,249,280 bytes The remainder is a fraction of a cylinder, but still a multiple of a 63 sector "fake track". A person can take that 500,107,862,016 number, and convert to GB or GiB as they see fit. Paul |
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2048 GB Hard Disk
XS11E wrote:
"Dave \"Crash\" Dummy" wrote: Hard disk Size wrote: Is 2048GB Hard Disk same as 2TB Hard Disk? Yes. First correct answer to a yes-or-no question! Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime. A yes-no response means the OP doesn't learn how to decipher on his own. Knowledge weans the child from ignorance and dependence. |
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