Which disk is TOS installed on?

New system installation, system re-install
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EthanLiu
TM Product Manager
Posts: 177
Joined: 13 Nov 2023, 14:25
China

Which disk is TOS installed on?

Post by EthanLiu »

Applicable models: All TNAS models
Applicable versions: TOS 5 / TOS 6

During or after the installation of the system, you may need to determine which disk the system is installed on. Below is a detailed guide for TOS 5 and TOS 6 versions:

1. TOS 5 Version
In TOS 5, all selected disks for installation are treated as system disks. Therefore, during the installation process, the initialization program automatically configures all selected disks as system disks. As a result, TOS 5 considers them as system disks and stores system data on them.

2. TOS 6 Version
TOS 6 supports up to two disks as system disks by default. Here are the steps to determine the system disk:

①. System disk selection during installation
Automatic Initialization: If you choose automatic initialization to install TOS 6, the system will automatically select the first two disks (e.g., HDD 1 and HDD 2) as system disks, based on the disk slot order.
Custom Initialization: If you choose custom initialization, the system will list all inserted disks, allowing you to manually select two disks as the system disks.

②. Confirming the system disk after installation
If TOS 6 has already been installed, you can confirm which disk is configured as the system disk by following these steps:
  • Go to TOS > Control Panel > Storage Management > Disk page.
  • On this page, you can view detailed information for all disks. The system disk is typically marked with a "System Disk" label.
  • Based on the label on the disk, you can easily identify the current system disk.
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LordP
Posts: 25
Joined: 24 Jul 2025, 01:16
United States of America

Re: Which disk is TOS installed on?

Post by LordP »

I've read a ton of stuff in this forum, and I'm still not 100% sure what to do.

I just got my F4-423 today, and I'm adding two 4TB M2 SSDs - and I'm hoping to install TOS on one and use the second as a cache.

Is that permissible? Are there instructions?

I'll also have 32GB of RAM if that makes a difference.

Thank you.
F4-423
TOS version is 6.0.694
BIOS is 5.19
Hard drives 4x ST24000NT002-3N1101 24TB Iron Wolf Pro
TOS - Crucial P310 4TB PCIe Gen4 2280 NVMe M.2
Hypercache - Crucial P310 4TB PCIe Gen4 2280 NVMe M.2
OWC 32GB (2x16GB) DDR4 3200 PC4-25600 CL22
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TMzethar
TM Support
Posts: 2818
Joined: 27 Oct 2020, 16:43

Re: Which disk is TOS installed on?

Post by TMzethar »

LordP wrote: 24 Jul 2025, 04:59
Since it is uncertain whether your guidance system will install TOS5 or TOS6, please follow the following secure operation steps:
First, install one SSD into F4-423 and then start the NAS to initialize TOS.
After installation is complete, turn off the NAS, install the other SSD and HDDs into F4-423, and start again.
Then, you can configure the other SSD as Hyper Cache.
To contact our team, please send email to following addresses, remember to replace (at) with @:
Technical team: support(at)terra-master.com (for technical support)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)
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