# shibo - @Seve what does this mean?

Channel: #contributor
Source: https://discord.com/channels/1233487248129921135/1537891971459326053
Started: 2026-08-14T18:33:39.438000+00:00
Last activity: 2026-08-14T18:37:16.409000+00:00

## shibo — 2026-08-14T18:33:38.647000+00:00

<@757706909351411845> what does this mean?
Attachment: Screenshot_2026-08-14_at_8.33.28_PM.png — https://community.tscircuit.com/media/1537891971098476705

## Seve — 2026-08-14T18:34:23.177000+00:00

you're using blind/buried vias

## Seve — 2026-08-14T18:34:34.145000+00:00

are you using the fanout solver

## shibo — 2026-08-14T18:35:41.478000+00:00

no

## shibo — 2026-08-14T18:36:16.876000+00:00

so these vias are a result of trying to route bgas without using fanouts?

## Seve — 2026-08-14T18:36:51.505000+00:00

no... i don't think the regular autorouter supports buried/blind vias so i'm wondering how you could possibly have them

## Seve — 2026-08-14T18:37:04.178000+00:00

they are vias that are only on some layers and not others

## Seve — 2026-08-14T18:37:12.807000+00:00

they are used during HDI/fanout

## Seve — 2026-08-14T18:37:16.409000+00:00

sometimes