Pricing
CATALOG
Class average, best price per GB:
SATA
$0.138
→ Holding (+2.9% since last reported)
Gen 4
$0.184
→ Holding (0.0% since last reported)
Gen 5
$0.199
→ Holding (−2.5% since last reported)
Snapshot Nov 2, 2026
Filters
Sorting all capacities by $/GB favors larger drives. Pick a capacity to compare like with like.
Drive
Capacity
Best price
$/GB
vs Class
Trend
ADATA SD810 USB 3.2 Gen2x2 (20 Gbps)
USB 20 Gbps · External
500GB
$89
at Amazon.
Lowest tracked price
$0.178
/GB
500GB
$92
at Amazon.
Lowest in ~9 days ($89)
$0.184
/GB
Up 3% vs last cycle
500GB
$129
at Amazon.
Lowest in ~23 days ($128)
$0.258
/GB
500GB
$139
/
$185
25% OFF
at Amazon.
Lowest tracked price
$0.278
/GB
Down 13% vs last cycle
500GB
$139
at Amazon.
Lowest in ~9 days ($99)
$0.278
/GB
Up 20% vs last cycle
500GB
$160
/
$169
5% OFF
at Amazon.
Lowest in ~1 month ($157)
$0.320
/GB
500GB
$350
at Amazon.
Lowest in ~15 days ($343)
$0.700
/GB
Up 1% vs last cycle
7 of 7
About the Scores
Every drive in our catalog meets a minimum performance bar; drives below it aren't listed. The score answers one question: how much of its interface's potential does this drive actually deliver? It's based on published read and write speeds, whether smaller capacities keep the same write speed, and whether the drive has a DRAM cache, each measured against the best drive on the same interface. Because scores are relative to the interface, a Gen3 drive and a Gen5 drive can both score near 10 even though the Gen5 drive is much faster. To compare like with like, filter by interface class.