Quick answer: For the drive your operating system and apps run from, choose a solid-state drive (SSD). It has no moving parts, so it is much faster to start up and load programs, quieter and more resistant to knocks than a hard disk drive (HDD). A hard drive still makes sense for cheap bulk storage and backups, where capacity per rupee matters more than speed.
Most people now buy a laptop rather than a desktop, and one of the first choices is the storage drive. The right choice depends on your needs and budget. If you want speed and smooth performance, an SSD is the answer. If you only need lots of space for files you rarely open, a hard drive can still do the job well, often as a second or external drive.
What is an SSD?
A solid-state drive stores data on NAND flash memory chips, the same basic technology used in USB pen drives and memory cards, but faster and more refined. Flash memory is non-volatile, which means it keeps your data when the power is off.
Because there is no spinning platter or moving read/write arm, all the work is done by the drive’s controller. It manages where data is written, spreads wear evenly across the memory cells and keeps some capacity in reserve (called over-provisioning) for maintenance and replacing worn cells. That is why an SSD’s usable capacity can be a little lower than the raw amount of flash on board.
What is a hard drive?
A hard disk drive stores data magnetically on spinning platters, read by a head on a moving arm. That mechanical design is why hard drives are slower to find data, make some noise and are more vulnerable to drops while running. Western Digital’s current WD Blue desktop hard drives, for example, spin at 5,400 or 7,200 rpm and are rated at up to 150 to 260 MB/s depending on the model, as of October 2026.
SSD vs hard drive at a glance
| Factor | SSD | Hard drive (HDD) |
|---|---|---|
| How it stores data | Flash memory chips, no moving parts | Magnetic spinning platters and a moving head |
| Speed | Much faster; quick boot and app loading | Slower, especially for many small files |
| Typical sequential read (as of Oct 2026, makers’ figures) | Up to 545 MB/s for a SATA model (SanDisk SSD Plus); up to 7,300 MB/s for a PCIe 4.0 NVMe model (WD_BLACK SN850X) | Up to 150 to 260 MB/s (WD Blue desktop range) |
| Durability | Better at handling knocks and vibration | More sensitive to drops while running |
| Noise | Silent | Audible spinning and seeking |
| Best use | Operating system, apps, games, active projects | Bulk storage, media archives, backups |
SATA or NVMe: which kind of SSD?
An earlier version of this article said SSDs use SATA. Some do, but there are two main types today:
- SATA SSDs use the same connection as hard drives and usually come in the 2.5-inch size that fits a laptop or desktop drive bay. They are a simple upgrade for older machines. Their speed is limited by the SATA interface; SanDisk, for example, rates its SSD Plus at up to 545 MB/s sequential read.
- NVMe SSDs connect over PCI Express (PCIe), usually as a small M.2 stick. They are much faster. Sandisk rates its WD_BLACK SN850X, a PCIe 4.0 drive, at up to 7,300 MB/s, and notes that PCIe 4.0 speed needs a compatible motherboard (the drive also works, more slowly, in PCIe 3.0 slots).
Most recent laptops use M.2 NVMe drives. Before you buy an upgrade, check your laptop’s manual or the manufacturer’s support page for the slot type, size (for example M.2 2280) and supported PCIe generation.
What happened to the test in the original article
The original article described a benchmark of a 240 GB SanDisk SSD Plus against a Crucial BX100 and a Corsair Neutron XT, run with the CrystalDiskMark benchmarking software on a SATA 6 Gb/s (SATA-600) port. That test was not carried out by edefines, and we could not trace who ran it. The drives in it are older models, so we have removed the specific results rather than repeat figures we cannot check.
Two points from it still hold. First, connect a SATA SSD to a SATA 6 Gb/s port; an older, slower port limits its speed. Second, entry-level SSDs are slower at sustained writes than premium models, but even a budget SSD feels far quicker in everyday use than a hard drive.
The SanDisk SSD Plus itself is still sold. As of October 2026, Sandisk’s store lists it in 250 GB, 500 GB, 1 TB and 2 TB capacities as a 2.5-inch SATA drive with a three-year warranty or the drive’s endurance (TBW) limit, whichever comes first. Sandisk is now a separate company from Western Digital, which spun off its flash business.
Things to check before you buy an SSD
- Interface and size: SATA 2.5-inch or M.2 NVMe, and which PCIe generation your computer supports.
- Capacity: leave room to spare. Windows, apps and updates fill a small drive quickly.
- Endurance and warranty: look at the warranty length and the TBW (terabytes written) rating, which tells you how much data the maker expects the drive to handle.
- Price per GB: prices change often, so compare current prices for the capacity you need. Hard drives generally still offer more space for the money.
- Backups: no drive, SSD or hard drive, is a backup on its own. Keep important files in at least one other place, such as an external drive or a cloud service.
If you are building or upgrading a gaming setup, see our look at new gaming devices in India. For small businesses weighing local drives against online storage, our guide to how cloud technology can save money may help.
Frequently asked questions
Is an SSD worth it over a hard drive?
For the drive that runs your operating system and apps, yes. The difference in start-up and loading times is the most noticeable upgrade most older computers can get. For bulk storage, a hard drive is still good value.
Can I replace my laptop’s hard drive with an SSD?
Usually, if the laptop has a 2.5-inch bay (use a 2.5-inch SATA SSD) or an M.2 slot (use an M.2 SSD of the supported type). Check the manual first, and copy or back up your data before you swap drives.
Do SSDs wear out?
Flash cells can only be written a limited number of times, which is why makers publish an endurance (TBW) rating. For typical home use, the warranty period and TBW rating are a good guide to expected life.
What is the difference between SATA and NVMe SSDs?
SATA SSDs use the older SATA connection and top out at around 550 MB/s. NVMe SSDs use PCI Express and can be many times faster, but your computer needs a compatible M.2 slot.
Checked in October 2026 against Sandisk’s product pages for the SanDisk SSD Plus and WD_BLACK SN850X and Western Digital’s WD Blue hard drive listings. Specifications and prices change, so check the maker’s page before you buy.
