HDD_TCO_Worksheet.xlsx
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Last update:3/9/2013Notes
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Service life (y):6
The length of time for which I typically use a disk
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Wh rate:0.000174
The cost of power - This is dollars per Watt-hour (instead of the more typical per kilowatt-hour)
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Idle : R/W0.8
The ratio of drive idle time to drive read/write time (drives use more power when active)
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Cooling W : HDD W0.3
The ratio of cooling wattage to HDD wattage (in other words, how much it costs to run an A/C unit in my basement)
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PSU Waste0.35
The ratio of power wasted by the PSU for the system in which the HDD is mounted, compared to total power consumed - it's the inverse of the PSU's efficiency rating, basically
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GBCap CostIdle (W)R/W (W)
WCost /mo
W Cost/lifeTCO
TCO/GB
TCO infra
TCO/GB infra
Column Notes
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Seagate 5900RPM 3.5"
4000$18955$0.626$45$234$0.059$268.15$0.067
GB - The size of the disk in gigabytes (appx)
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WD Red EFRX 3.5"3000$1464.14.4$0.521$38$184$0.061$211.85$0.071
Cap Cost - The capital (initial) cost to buy the drive
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WD Green 3.5"3000$1395.56$0.702$51$190$0.063$227.65$0.076
Idle (W) - The amount of power the drive uses when idle, in Watts
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WD Green EARX 3.5"2000$1053.35.3$0.464$33$138$0.069$163.57$0.082
R/W (W) - The amount of power the drive uses when it's reading and/or writing (disks generally use more power when writing, but this is an estimated average)
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WD Red EFRX 3.5"2000$1194.14.4$0.521$38$157$0.078$184.85$0.092
WCost/mo - The calculated cost per month to operate the drive before considering cooling or PSU efficiency
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WD Green NPVT 2.5"2000$1790.81.7$0.123$9$188$0.094$194.51$0.097
W Cost/life - The calculated lifetime cost to operate the drive before considering cooling or PSU efficiency
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WD Blue JPVT (5400) 2.5"
1000$900.591.4$0.094$7$97$0.097$101.90$0.102
TCO - The Total Cost of Ownership for the drive over its lifetime, before considering cooling or PSU efficiency
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WD RE 3.5"4000$3019.211.5$1.210$87$388$0.097$453.92$0.113
TCO/GB - The TCO for the drive over its lifetime on a per-gigabyte basis, before considering cooling or PSU efficiency
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WD Black 2.5"500$700.81.75$0.124$9$79$0.158$85.67$0.171
TCO infra - The TCO for the drive over its lifetime, including the cooling and PSU efficiency costs
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WD Green 3.5"500$702.13.6$0.301$22$92$0.183$107.99$0.216
TCO/GB infra - The TCO for the drive over its lifetime on a per-gigabyte basis, including all costs
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WD Blue LPVT (5400) 2.5"
320$590.551.4$0.090$6$65$0.205$70.40$0.220
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WD Black 2.5"320$600.81.75$0.124$9$69$0.215$75.67$0.236
TCO/GB infra is the "main" number here: It's the actual cost of storing files.
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WD Black 3.5"500$856.16.8$0.782$56$141$0.283$183.78$0.368
For example, to storing a 40GB UHD movie for 6 years on a 4TB Seagate 5900RPM drive would cost $2.68.
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WD Raptor 3.5"500$1494.25.1$0.549$40$189$0.377$218.34$0.437
Storing that same movie on a PNY Prevail SSD would cost $49.32!
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WD Raptor 2.5"500$1494.25.1$0.549$40$189$0.377$218.34$0.437
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Seagate 10K 2.5"300$803.483.73$0.442$32$112$0.373$135.88$0.453
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WD Blue AAKS 3.5"320$507.27.8$0.917$66$116$0.363$165.88$0.518
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Seagate NL35 (IBM)400$5010.413$1.368$99$149$0.371$222.87$0.557
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Seagate 15K 2.5"300$1408.748.98$1.101$79$219$0.731$279.12$0.930
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PNY Prevail SSD120$1400.12.1$0.063$5$145$1.204$147.92$1.233
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Samsung ST1000LM024 2.5"
1000$700.72.2$0.125$9$79$0.079$85.83$0.086
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Reliable
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Archive
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IOPS
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