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#11
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Samsung 1.5 TB drive
On Sun, 22 Mar 2009 07:18:30 -0700, "Eric Gisin"
put finger to keyboard and composed: Obviously you didn't fill it will data. 1.5TB weighs 36g. I zero-filled it. BTW I've determined (by comparing the known weights of coins against the scale reading) that my scales overestimate by 2.7%, so the actual difference is even greater. "Franc Zabkar" wrote in message .. . Out of curiosity I've weighed the spindle motor (46g), voice coil actuator (22g) and one platter (14g) out of an unknown IDE drive, so I'm wondering where the weight difference comes from. Incidentally, a Seagate model ST3320620A HD that is specified to weigh 635g, on average, weighs only 596g on my scales, so I'm wondering if this 40g variation is genuine or whether it reflects an inaccuracy in my scales. If it is genuine, then I can't see where it is coming from. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#12
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Samsung 1.5 TB drive
On 22 Mar 2009 19:45:56 GMT, Arno put finger to
keyboard and composed: jdkki wrote: Franc Zabkar wrote On 21 Mar 2009 21:26:55 GMT, Arno put finger to keyboard and composed: Franc Zabkar wrote: I'm wondering why Samsung is not yet offering a 2TB drive. Seagate's ST31500341AS 1.5TB drive appears to have 4 platters, so it stands to reason that Samsung should be able to fit 4 x 500GB platters in the same form factor. Instead of playing catch-up, Samsung could be taking the lead ??? Maybe Samsung (being a large engineering enterprise with expertise in many fields) is more concerned about reliability than taking the lead? They can afford it. And when you look at the recent bad press Seagate had, maybe not being there first has its advantages. In addition, Samsung HDDs have a reputation of being very quiet and low-poer. That could be difficult with 4 platters. Actually WD have already released a 2TB drive with 4 platters: http://www.wdc.com/en/library/sata/2879-701229.pdf (March 2009 brochure) Strangely the WD20EADS (2TB) and WD15EADS (1.5TB) models both have the same acoustic specs, same weight, and same power specs. Nothing strange about it, likely the 1.5TB drives are drives with one platter not viable and so not used. I notice that some Seagate [embedded servo] models have an odd number of heads. Assuming that the WD15EADS has a dud platter, then why discard the entire platter if one surface is still OK? Why not market a 1.75TB drive in this case? Even the 500GB model has the same acoustics. No reason why the number of platters should make any difference to the acoustics if the same rotation motor is used. The motor makes practically no sound. Sound sources (during non-seek) is air turbulences caused by the platters and vibration from the platters not being exactly centerd. Both go up with more platters. Arno So why isn't there a corresponding difference in the WD specs? - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#13
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Samsung 1.5 TB drive
Franc Zabkar wrote:
I zero-filled it. Zeroes weigh more than ones -- unless they're filled with helium. |
#14
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Samsung 1.5 TB drive
Franc Zabkar wrote:
On 22 Mar 2009 19:45:56 GMT, Arno put finger to keyboard and composed: jdkki wrote: Franc Zabkar wrote On 21 Mar 2009 21:26:55 GMT, Arno put finger to keyboard and composed: Franc Zabkar wrote: I'm wondering why Samsung is not yet offering a 2TB drive. Seagate's ST31500341AS 1.5TB drive appears to have 4 platters, so it stands to reason that Samsung should be able to fit 4 x 500GB platters in the same form factor. Instead of playing catch-up, Samsung could be taking the lead ??? Maybe Samsung (being a large engineering enterprise with expertise in many fields) is more concerned about reliability than taking the lead? They can afford it. And when you look at the recent bad press Seagate had, maybe not being there first has its advantages. In addition, Samsung HDDs have a reputation of being very quiet and low-poer. That could be difficult with 4 platters. Actually WD have already released a 2TB drive with 4 platters: http://www.wdc.com/en/library/sata/2879-701229.pdf (March 2009 brochure) Strangely the WD20EADS (2TB) and WD15EADS (1.5TB) models both have the same acoustic specs, same weight, and same power specs. Nothing strange about it, likely the 1.5TB drives are drives with one platter not viable and so not used. I notice that some Seagate [embedded servo] models have an odd number of heads. Assuming that the WD15EADS has a dud platter, then why discard the entire platter if one surface is still OK? Why not market a 1.75TB drive in this case? Even the 500GB model has the same acoustics. No reason why the number of platters should make any difference to the acoustics if the same rotation motor is used. The motor makes practically no sound. Sound sources (during non-seek) is air turbulences caused by the platters and vibration from the platters not being exactly centerd. Both go up with more platters. Arno So why isn't there a corresponding difference in the WD specs? Indeed. I have seen this before with other drive families. One thing is that the specs do not all have to be exact. Maybe they just measured the worst one and then gave the same number to the others. Anyways, drieve noise specs are often quide different from what the drive noise really is. One reason a really thorough HDD review includes measurements for that. Power specs are often not the full story as well. I think it is basically sloppy measurement or no measurement of specs that most customers never look at. Arno |
#15
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Samsung 1.5 TB drive
Franc Zabkar wrote:
On Sun, 22 Mar 2009 07:18:30 -0700, "Eric Gisin" put finger to keyboard and composed: Obviously you didn't fill it will data. 1.5TB weighs 36g. I zero-filled it. Ah, less entropy, less weight! Seriously, the difference is too small to be measurable. And modern encodung puts about the same number of 0 and 1 on the platters anyways, regardless of what data you write. BTW I've determined (by comparing the known weights of coins against the scale reading) that my scales overestimate by 2.7%, so the actual difference is even greater. Lets just say that a lot of HDD specs are stated with large tolerances (i.e. sloppy measurements and/or sloppy manufacturing). Arno "Franc Zabkar" wrote in message . .. Out of curiosity I've weighed the spindle motor (46g), voice coil actuator (22g) and one platter (14g) out of an unknown IDE drive, so I'm wondering where the weight difference comes from. Incidentally, a Seagate model ST3320620A HD that is specified to weigh 635g, on average, weighs only 596g on my scales, so I'm wondering if this 40g variation is genuine or whether it reflects an inaccuracy in my scales. If it is genuine, then I can't see where it is coming from. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#16
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Samsung 1.5 TB drive
Arno wrote:
jdkki wrote: Franc Zabkar wrote On 21 Mar 2009 21:26:55 GMT, Arno put finger to keyboard and composed: Franc Zabkar wrote: I'm wondering why Samsung is not yet offering a 2TB drive. Seagate's ST31500341AS 1.5TB drive appears to have 4 platters, so it stands to reason that Samsung should be able to fit 4 x 500GB platters in the same form factor. Instead of playing catch-up, Samsung could be taking the lead ??? Maybe Samsung (being a large engineering enterprise with expertise in many fields) is more concerned about reliability than taking the lead? They can afford it. And when you look at the recent bad press Seagate had, maybe not being there first has its advantages. In addition, Samsung HDDs have a reputation of being very quiet and low-poer. That could be difficult with 4 platters. Actually WD have already released a 2TB drive with 4 platters: http://www.wdc.com/en/library/sata/2879-701229.pdf (March 2009 brochure) Strangely the WD20EADS (2TB) and WD15EADS (1.5TB) models both have the same acoustic specs, same weight, and same power specs. Nothing strange about it, likely the 1.5TB drives are drives with one platter not viable and so not used. Even the 500GB model has the same acoustics. No reason why the number of platters should make any difference to the acoustics if the same rotation motor is used. The motor makes practically no sound. Wrong, as always. Sound sources (during non-seek) is air turbulences caused by the platters Wrong, as always. and vibration from the platters not being exactly centerd. Wrong, as always. Both go up with more platters. Wrong, as always. |
#17
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Samsung 1.5 TB drive
Franc Zabkar wrote:
On 22 Mar 2009 19:45:56 GMT, Arno put finger to keyboard and composed: jdkki wrote: Franc Zabkar wrote On 21 Mar 2009 21:26:55 GMT, Arno put finger to keyboard and composed: Franc Zabkar wrote: I'm wondering why Samsung is not yet offering a 2TB drive. Seagate's ST31500341AS 1.5TB drive appears to have 4 platters, so it stands to reason that Samsung should be able to fit 4 x 500GB platters in the same form factor. Instead of playing catch-up, Samsung could be taking the lead ??? Maybe Samsung (being a large engineering enterprise with expertise in many fields) is more concerned about reliability than taking the lead? They can afford it. And when you look at the recent bad press Seagate had, maybe not being there first has its advantages. In addition, Samsung HDDs have a reputation of being very quiet and low-poer. That could be difficult with 4 platters. Actually WD have already released a 2TB drive with 4 platters: http://www.wdc.com/en/library/sata/2879-701229.pdf (March 2009 brochure) Strangely the WD20EADS (2TB) and WD15EADS (1.5TB) models both have the same acoustic specs, same weight, and same power specs. Nothing strange about it, likely the 1.5TB drives are drives with one platter not viable and so not used. I notice that some Seagate [embedded servo] models have an odd number of heads. Yes. Assuming that the WD15EADS has a dud platter, then why discard the entire platter if one surface is still OK? Why not market a 1.75TB drive in this case? You get too many models with a 3 platter drive. Even the 500GB model has the same acoustics. No reason why the number of platters should make any difference to the acoustics if the same rotation motor is used. The motor makes practically no sound. Sound sources (during non-seek) is air turbulences caused by the platters and vibration from the platters not being exactly centerd. Both go up with more platters. So why isn't there a corresponding difference in the WD specs? Because he's just plain wrong. |
#18
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Samsung 1.5 TB drive
Arno wrote:
Franc Zabkar wrote: "Eric Gisin" wrote: Obviously you didn't fill it will data. 1.5TB weighs 36g. 8) I zero-filled it. Ah, less entropy, less weight! Seriously, the difference is too small to be measurable. Really? Are you sure, Arno? 8/ |
#19
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Samsung 1.5 TB drive
Eric Gisin wrote:
Obviously you didn't fill it will data. 1.5TB weighs 36g. What I'm wondering is how the centrifugal force doesn't spin all that data right off the platters! |
#20
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Samsung 1.5 TB drive
chrisv wrote:
Arno wrote: Franc Zabkar wrote: "Eric Gisin" wrote: Obviously you didn't fill it will data. 1.5TB weighs 36g. 8) I zero-filled it. Ah, less entropy, less weight! Seriously, the difference is too small to be measurable. Really? Are you sure, Arno? 8/ The interesting thing is that it actually does make a difference :-) Arno |
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