Perfect — I’ll give you a clear, safe, copy‑pasteable plan you can use on Thursday when you bring the new 2 TB Seagate home. Two short parts: (A) quick health check with Seagate SeaTools, (B) initialize as GPT and make 256 GB volumes using either Disk Management (GUI) or diskpart (one‑shot commands). I’ll show the exact diskpart script you can use (replace the disk number) and include safety warnings. I’ll also explain how to handle the remainder so you don’t accidentally run out of space.
Why GPT for this drive
- GPT avoids the old 4‑partition/2 TB MBR limits and is the modern format for large external drives. If the drive is brand new, converting/initializing as GPT is simple and safe — but only on a new/empty disk. (If the disk has any data, back it up first.
A — Before you touch anything: health check (SeaTools)
- Download and run Seagate SeaTools for Windows (or SeaTools Boot) and run:
- Quick SMART check (Health)
- Short/Quick test (short read/write / drive electronics)
- If SeaTools reports reallocated sectors, pending sectors or failures — do not trust the drive; return/exchange it.
This step is recommended before you rely on the drive for images/backups.
B — Initialize as GPT and create 256 GB volumes
Note: these steps assume the drive is new or you are OK erasing it. If the drive already contains anything you must copy it off first.
Option 1 — GUI (Disk Management) — easiest, click‑by‑click
- Connect the Seagate to a USB 3.0 port and ensure Windows sees it.
- Right‑click Start → Disk Management. If the disk is uninitialized you’ll get an “Initialize Disk” prompt. Choose GUID Partition Table (GPT) and click OK. If it’s already initialized MBR, you should wipe only if you’re OK erasing it (see warnings).
- Right‑click the unallocated area → New Simple Volume → Next. For “Specify volume size” enter 262144 MB (this equals 256 GB in diskpart/MB units) → Next → assign the desired drive letter (e.g., H
→ Format as NTFS (Default allocation unit size) → Quick Format checked → Finish.
- Repeat New Simple Volume for each 256 GB slice. For the final volume, if the remaining space is smaller than 262144 MB, simply create the final volume with the remainder (leave some small free space optionally). If Disk Management blocks because of partition limits, use diskpart below. The GUI is safe and visual; most users prefer it.
Option 2 — DiskPart (accurate, repeatable — copy/paste into elevated Command Prompt)
- Use this if you like a single script or if Disk Management misbehaves. IMPORTANT: diskpart clean will erase the entire disk. Verify the disk number first.
1) Open an elevated Command Prompt (Run as Administrator) and type:
diskpart
list disk
2) Identify your Seagate by size in the list (note its disk number, replace X below). Then run (one line at a time):
select disk X <-- replace X with the Seagate disk number — double-check!
clean <-- WARNING: erases the entire disk
convert gpt <-- make GPT partition table
create partition primary size=262144
format fs=ntfs quick label=PART1
assign letter=H
create partition primary size=262144
format fs=ntfs quick label=PART2
assign letter=I
create partition primary size=262144
format fs=ntfs quick label=PART3
assign letter=J
create partition primary size=262144
format fs=ntfs quick label=PART4
assign letter=K
create partition primary size=262144
format fs=ntfs quick label=PART5
assign letter=L
create partition primary size=262144
format fs=ntfs quick label=PART6
assign letter=M
create partition primary <-- no size = use remaining space
format fs=ntfs quick label=REST
assign letter=N
exit
Notes about the script
- Size values are in MB. 256 GB = 256 × 1024 = 262144 MB. If the disk’s usable space is slightly less (real drives report binary GiB differently), one of the create partition commands may fail; if that happens, create fewer 256 GB partitions and let the final "create partition primary" use the remainder. The DiskPart flow above is the same approach shown in Windows partitioning guides.
Safety & gotchas (please read)
- Triple‑check the disk number in diskpart list disk before running clean. Clean will irrevocably erase the selected disk. I recommend pausing and confirming the disk size and the presence/absence of other disks before continuing.
- If the drive was previously used and shows as MBR, clean + convert gpt will be needed (the diskpart script does that). If you want to keep existing data, do not run clean — back up first.
- If Windows treats the enclosure as removable and you later have issues with multi‑partition behavior, use VHDX files as a non‑destructive workaround (create VHDX on NTFS partition and mount it). This avoids weird “removable” multi‑partition quirks.
After partitioning — finishing checks
- In Disk Management confirm all volumes show NTFS, Healthy, and have the letters you assigned.
- Run a quick chkdsk on each new volume to confirm there’s no early filesystem issue: chkdsk H: /f (repeat for each letter).
- Eject safely: use the Safely Remove Hardware icon before unplugging.
- Keep SeaTools log (or save SMART report) in case you need an RMA later.
If you want, I’ll do one of two follow‑ups on Thursday after you buy the disk
- A: I’ll give you the exact diskpart commands pre‑filled if you paste the output of diskpart → list disk (so I can set the correct disk number for you). That removes risk of using the wrong disk number.
- B: Walk you through the Disk Management GUI step‑by‑step while you do it (I’ll wait for your “next” clicks). No typing required.
Which do you prefer: “Fill script for me (I’ll paste list disk)” or “GUI walk‑through”?