Do you test every flash unit before shipping?
Yes. Every unit goes through capacity verification and read/write testing as part of our production flow, before packing — not as a separately requested extra that adds cost. The capacity check is a full write-and-read-back: the drive is filled with data and read back, so the capacity you receive is the capacity that actually holds data, not the number the controller reports. You can repeat the same test independently on any unit using the published H2testw method. The point of testing in-house is consistency across the batch and across repeat orders; the point of publishing the method is that you do not have to take our word for it. This is also why grade discipline matters more than price in a tight market — testing confirms capacity, not the grade of the silicon.
What the in-house test covers
Two things are checked on every unit before packing: that the capacity is real, and that the unit reads and writes correctly.
- Capacity verification — a full write-and-read-back, not a controller-reported number
- Read/write test — the unit must read back every byte it wrote
- Held across repeat batches — the same configuration is built each time, so the test result is comparable order to order
Why a published method matters
Capacity testing confirms capacity, not the silicon grade. In a tight memory market, grade discipline can weaken across the industry, so the ability to verify independently — on any unit, from any supplier — is worth more than a passing result on a hand-picked sample.
We publish the H2testw method and the reasoning behind it, and we recommend buyers test a random sample from their own production batch rather than a sample unit the supplier chose.
Sources
Figures quoted on this page are from the published reporting listed above. Where a number is an estimate rather than a published figure, it is described as approximate.
Frequently asked questions
Does passing your test mean the drive is high quality?
It confirms the capacity is real and the unit reads and writes correctly. It does not by itself establish the silicon grade, endurance or long-term retention — which is why we state the grade and source per project and recommend independent batch sampling.
Can I verify the units myself after delivery?
Yes, and we recommend it. The H2testw method (or F3 on macOS and Linux) fills the drive with data, reads it back and flags any byte that fails. Test a genuinely random sample from the batch you receive, not a unit chosen by the supplier.
What happens if a batch sample fails?
Raise it with us and test more of the same batch. One failed unit in a batch is a warning about the whole batch. We document our test method so the conversation about any failure starts from the same facts.
Working on a specification?
Send us the product type, capacity, quantity and target date. We reply to business enquiries within 1 business day.
Request a quote